Academic literature on the topic 'Anisotropy of magnetic susceptibility'

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Journal articles on the topic "Anisotropy of magnetic susceptibility"

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Blunk, Inken. "Magnetic Susceptibility Anisotropy and Deformation in Quaternary Lake Sediments." Zeitschrift der Deutschen Geologischen Gesellschaft 140, no. 2 (January 1, 1989): 393–403. http://dx.doi.org/10.1127/zdgg/140/1989/393.

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Rongkonusa, Melisa, Gerald Tamuntuan, and Guntur Pasau. "Analisis Anisotropi Suseptibilitas Magnetik Batuan Beku Lengan Utara Sulawesi." Jurnal MIPA 6, no. 1 (May 2, 2017): 8. http://dx.doi.org/10.35799/jm.6.1.2017.15846.

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Telah dilakukan penelitian untuk menentukan pola anisotropi suseptibilitas magnetik dan status singkapan batuan beku dari pola yang diperoleh. Pengukuran anisotropi suseptibilitas magnetic dilakukan pada lima sampel batuan beku dari Sulawesi Utara menggunakan Bartington MS2B. Arah pengukuran sampel disesuaikan dengan desain Tauxe. Hasilnya menunjukkan bahwa suseptibilitas maksimum terdistribusi disekitar arah utara dan timur. Sedangkan suseptibilitas intermediet dan minimum terdistribusi disekitar Utara-Timur dan Timur-Selatan. Elipsoida suseptibilitas cenderung prolate atau lebih lonjong. Batuan beku yang dianalisis merupakan kelompok batuan terobosan yang mekanisme lelehannya terjadi secara vertikal.A research has been conducted to determine the anisotropic pattern of magnetic susceptibility and the status of igneous rocks exposure from the obtained pattern. We have measured the anisotropy of magnetic susceptibility on five samples of igneous rock from North Sulawesi by Bartington MS2B. The position of samples were adjusted according to the Tauxe’s design. The result shows that the maximum susceptibility is distributed around northward and eastward, while the intermediate and minimum susceptibility are distributed around nortward-eastward and eastward-southward. The susceptibility ellipsoid tends to be prolate or more oval. This shows that the igneous rocks that have been analyzed are group of intrusive rocks which melting mechanism occurs through vertical fracture.enetie
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HU, AI-YUAN, and YUAN CHEN. "TWO-DIMENSIONAL ANISOTROPIC HEISENBERG FERROMAGNET IN COEXISTING TRANSVERSE AND LONGITUDINAL MAGNETIC FIELDS." International Journal of Modern Physics B 21, no. 22 (September 10, 2007): 3877–87. http://dx.doi.org/10.1142/s0217979207037879.

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The two-dimensional spin-1/2 anisotropic Heisenberg ferromagnet is investigated in coexisting transverse and longitudinal magnetic fields. Using the Green function treatment, the magnetization and susceptibility are studied as a function of temperature, anisotropy and magnetic fields. The effects of exchange anisotropy and transverse magnetic field on the magnetic properties of the system are discussed.
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Johnston, D. C., and J. H. Cho. "Magnetic-susceptibility anisotropy of single-crystalBi2Sr2CaCu2O8." Physical Review B 42, no. 13 (November 1, 1990): 8710–13. http://dx.doi.org/10.1103/physrevb.42.8710.

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Borradaile, Graham John, and Mike Stupavsky. "Anisotropy of magnetic susceptibility: Measurement schemes." Geophysical Research Letters 22, no. 15 (August 1, 1995): 1957–60. http://dx.doi.org/10.1029/95gl01910.

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Khordad, R. "Effect of temperature on magnetic susceptibility and thermodynamic properties of an asymmetric quantum dot in tilted magnetic field." Modern Physics Letters B 29, no. 23 (August 30, 2015): 1550127. http://dx.doi.org/10.1142/s0217984915501274.

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In this paper, the specific heat, entropy and magnetic susceptibility of an asymmetric GaAs quantum dot (QD) are studied under the influence of temperature and a tilted external magnetic field. We first calculate the analytical wave functions and energy levels using a transformation to simplify the Hamiltonian of the system. Then, we obtain the analytical expressions for specific heat, entropy and magnetic susceptibility as the function of temperature, magnetic field and its direction for various anisotropy of the system. According to the results obtained from the present work, we find that (i) the specific heat and entropy are decreased when the magnetic field increases. (ii) When anisotropy is increased, the specific heat and entropy decrease. (iii) At large magnetic fields, the anisotropy has not important effect on specific heat and entropy. In briefly, the magnetic field, magnetic field direction and anisotropy play important roles in the specific heat, entropy and magnetic susceptibility of an asymmetric QD.
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Cimpoesu, Dorin, Leonard Spinu, and Alexandru Stancu. "Transverse Susceptibility Method in Nanoparticulate Magnetic Media." Journal of Nanoscience and Nanotechnology 8, no. 6 (June 1, 2008): 2731–44. http://dx.doi.org/10.1166/jnn.2008.18304.

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Transverse susceptibility (TS) method is a reliable method for the determination of anisotropy in nanoparticulate media. To correctly evaluate the value of anisotropy in various modern nanostructured materials, a number of theoretical problems related to the method have to be well understood to avoid significant systematic errors. This paper presents the state of the art in the TS method which includes the expression for single domain particles with any type of anisotropy, the theoretical and micromagnetic, using Landau-Lifshitz-Gilbert (LLG) equation and stochastic LLG equation studies of the effects of ac field amplitude, inter-particle interactions, and magnetic relaxation. The problem of both real and imaginary parts of the TS signal is also discussed.
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WANG, ZHAO-MING, and YUAN CHEN. "DOUBLE-TIME GREEN'S FUNCTION APPROACH TO THE SPIN 1/2 SPATIALLY ANISOTROPIC ANTIFERROMAGNETIC HEISENBERG MODEL." International Journal of Modern Physics B 18, no. 25 (October 20, 2004): 3361–71. http://dx.doi.org/10.1142/s0217979204026500.

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By use of the double-time Green's function method in the cubic-lattice S=1/2 anisotropic antiferromagnetic two-sublattice Heisenberg model, in the Tyablikov approximation, the staggered magnetization m, the correlation function and the static susceptibility are investigated. And the effects of spatial anisotropy are explored. The magnetic properties of this model are found to be dependent of anisotropy.
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Motoyama, Gaku, Hideki Sakai, Akira Yamaguchi, Akihiko Sumiyama, and Yasukage Oda. "Anisotropy of magnetic susceptibility of URu2Si2under pressure." Journal of Physics: Conference Series 273 (January 1, 2011): 012080. http://dx.doi.org/10.1088/1742-6596/273/1/012080.

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Levi, T., R. Weinberger, G. I. Alsop, and S. Marco. "Characterizing seismites with anisotropy of magnetic susceptibility." Geology 46, no. 9 (August 8, 2018): 827–30. http://dx.doi.org/10.1130/g45120.1.

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Dissertations / Theses on the topic "Anisotropy of magnetic susceptibility"

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Wang, Eric. "Anisotropy of Magnetic Susceptibility Investigation of the Coyote Mountain Shear Zone." Thesis, University of Louisiana at Lafayette, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10681403.

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The goal of this thesis is to test if the strain gradient preserved across the Coyote Mountain detachment shear zone can be correlated to change in the AMS fabric. Samples of granite mylonite derived from the Pan Tak granite were collected on a south-north transect across the Coyote Mountain shear zone, from lower structural levels up to the Ajo Road décollement. Evidence in the field shows an increasing degree of strain preserved in the mylonite, expressed by increasingly penetrative foliation and lineation with higher structural level toward the top of the shear zone. Strain was evaluated in the collected samples by application of the Rf/&PHgr; method. Results were then compared to anisotropy of magnetic susceptibility measurements in order to test whether magnetic fabric can be used as a reliable proxy for finite strain.

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Fanjat, Grégory. "Les fluctuations du champ magnétique terrestre : des variations séculaires récentes aux renversements." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20154/document.

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Le champ magnétique terrestre présente une vaste gamme de variations temporelles, de l'année à plusieurs millions d'années. J'ai étudié au cours de ma thèse divers aspects de ces fluctuations, des variations séculaires récentes aux renversements.La première partie de ma thèse porte sur l'archéomagnétisme, discipline qui permet de retracer l'évolution temporelle du champ magnétique terrestre au cours des derniers millénaires, principalement à partir des matériaux archéologiques. J'ai étudié deux jeux d'échantillons provenant pour l'un de la Grèce (période néolithique, 6800-3200 avant J.C.) et pour l'autre du Mexique (Palenque, période Maya Classique 320-840 après J.C.), dans le but d'acquérir de nouvelles données d'archéointensité et de mieux contraindre la variation séculaire du champ magnétique terrestre. La comparaison de mes données avec celles disponibles dans la bibliographie et avec les différents modèles globaux et régionaux a mis en évidence que les variations séculaires au Néolithique en Grèce et au cours du premier millénaire en Amérique Centrale sont très mal définies. Mes données suggèrent que des composantes locales, non prisent en compte dans les modèles globaux peuvent exister au niveau ces régions. Elles renforcent l'intérêt de développer des modèles régionaux précis, qui nécessitent un développement en harmoniques sphériques à un degré plus élevé. Pour ce faire, l'acquisition de nouvelles données de haute qualité est un élément majeur.La deuxième partie traite de la description d'un renversement du champ magnétique terrestre. Cette étude a été basée sur deux points précis: étudier les directions transitionnelles afin d'apporter de nouvelles contraintes sur le possible confinement longitudinal des pôles géomagnétiques virtuels (PGV) d'une part, et d'autre part vérifier des paléointensités transitionnelles obtenues sur la séquence volcanique d'Akaroa (Nouvelle Zélande), dont l'intensité est significativement supérieure à celles des intensités avant et après le renversement. Nous avons ré-échantillonné cette séquence, et l'évolution directionnelle obtenue pour ce renversement est une succession complexe de polarités N-T-R-T-N-T-R. Les PGV obtenus semblent se regrouper sous deux bandes longitudinales sous l'Australie et l'Amérique, ce qui renforce l'hypothèse d'une interaction entre le manteau et le noyau sur plusieurs millions d'années. Suite à une étude de minéralogie magnétique, j'ai sélectionné les échantillons susceptibles de fournir une valeur de paléointensité par les méthodes de Thellier et du multispecimen. Les paléointensités obtenues sont relativement faibles (environ 20 microT) au cours du changement de polarité et forte à la fin de la séquence. Mon interprétation, basée à la fois sur les valeurs de l'intensité du champ et sur les données radiochronologiques montrant que la séquence s'est mise en place très rapidement, est de considérer que seul le renversement C4Ar.1n-C4Ar.1r a été enregistré dans cette séquence. Dans cette hypothèse, le renversement montre un cheminement complexe comparable à d'autres renversements enregistrés dans l'hémisphère nord (Steens Mountain par exemple), incluant un phénomène de rebond avant de se stabiliser. La troisième partie de ma thèse est consacrée au développement d'une nouvelle méthodologie et d'un nouvel appareillage pour déterminer des paléointensités. Le faible taux de réussite des expériences de paléointensité de l'étude précédente m'a poussé à m'intéresser au protocole multispecimen, qui peut s'appliquer aux échantillons possédant un comportement polydomaine. L'inconvénient technique majeur de cette méthode réside dans l'application du champ le long de l'aimantation naturelle, difficile à réaliser avec précision dans les fours standards. Pour ce faire, nous avons décidé de développer des porte-échantillons permettant d'orienter les échantillons dans l'espace pour le four standard et un prototype de four à chauffage ultra-rapide particulièrement bie
The Earth's magnetic field shows a large range of temporal variations from the year to several million years. I studied during my PhD thesis several aspects of these fluctuations, from recent secular variations to reversals.The first part of my manuscript deals with archeomagnetism, a discipline that allows to track the temporal variations of the Earth's magnetic field through millennia, mainly from archeological materials. I studied two sets of samples, one from Greece (Neolithic period 6800-3200 B.C.) and the other from Mexico (Palenque, Maya Classic period 320-840 A.D.), to acquire new archeointensity data in order to better constrain the secular variation of the geomagnetic field. By comparing my data with those available in the literature and with the various global and regional models, I showed that the secular variations during the Neolithic in Greece and during the first millennium in Central America are poorly defined. My data suggest that local components, not described by global models, may exist in these regions. They reinforce the importance of developing specific regional models, which require development in higher spherical harmonic degree. As a consequence, the acquisition of new high quality data is of main importance. The second part presents the description of a geomagnetic field reversal. This work was based on two points: first by studying transitional directions to provide new constraints on the possible preferred longitudinal paths of virtual geomagnetic poles (VGPs) and second by checking transitional paleointensities obtained on a volcanic sequence in Akaroa volcano (New Zealand). Indeed the transitional field intensity is significantly higher than the field intensity before and after the reversal. We re-sampled this sequence, and the directional results show a complex sequence of N-T-R-T-N-T-R polarity. The transitional VGPs obtained are clustered in two longitudinal bands through Australia and America. This observation seems to reinforce the assumption of a core-mantle interaction over several million years. Following a rock magnetic study, I selected samples that could provide a value for the Thellier and multispecimen paleointensity methods. The obtained paleointensity are relatively low (about 20 microT) during the polarity change and strong at the end of the sequence.Based both on the field strength values and on the radiochronological ages, showing that the sequence was erupted in a very short time, I suggest that only the C4Ar.1n-C4Ar.1r reversal was recorded in this sequence. In this assumption, the reversal shows a complex path comparable to other reversals recorded in the northern hemisphere (for example the Steens Mountain), including a rebound before stabilizing.Finally the last part is devoted to the development of a new methodology and a new apparatus to determine absolute paleointensity. Following the low success rate of paleointensity experiments from the previous study, I decided to test the multispecimen protocol, which can be applied to samples yielding a predominant multidomaine behavior. The main technical drawback of this method lies in the application of the laboratory field along the natural remanent magnetization, a difficult task to perform accurately in standard paleointensity ovens. Thus, we decided to adapt sample holders from our standard oven in order to allow the sample orientation in space and to develop an ultra-fast heating oven prototype particularly well-suited for this method, allowing to apply the laboratory field in the 3 dimensions. I checked the different multispecimen protocols on historical lavas from Reunion and Etna volcano, yielding very different magnetic mineralogies. For all flows, I obtained paleointensities very close from the expected values, regardless from the magnetic mineralogy, revealing the feasibility of our apparatus and the promising interest of the method. The application of various corrections on the statistical estimation o
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Hernandez, Brett M. "Physical Volcanology, Kinematics, Paleomagnetism, and Anisotropy of Magnetic Susceptibility of the Nathrop Volcanics, Colorado." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1400251995.

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Bjork, Andreas. "Characterizing magnetic susceptibility and remanent magnetization of magnetite and hematite rich drill-core samples at Blötberget." Thesis, Uppsala universitet, Geofysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-347975.

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Laboratory magnetic measurements are used to develop a methodology to characterize the Kiruna-type Rare Earth Elements (REE) bearing apatite iron-oxide deposits at Blötberget in central Sweden. This high-grade ore deposit is known to have sharp boundaries between lens shaped main ore bodies of magnetite-rich ore, and a complex hematite-rich ore associated with pegmatites and skarn formation. The thesis covers laboratory magnetic measurements of 37 samples originating from eight drill cores and reference samples from previously mined area. It focuses on on-covering how the samples relate in terms of magnetic susceptibility, further its dependency on temperature, frequency, field and the orientation. The results are correlated with petrographic analysis previously performed on accompanying thin sections. The measurements show that magnetite with strong susceptibility contribution overshadow the hematite contribution in the samples. Transition changes in susceptibility are noticeable when crossing the Verwey temperature; -153°C, Curie temperature; 580°C and Néel temperature; 680°C. The Morin temperature appears at -60°C, or is missing. Linear relationships are identified between the magnitude difference in susceptibilities across transitions at high temperature and wt% magnetite and hematite have been identified. The Blötberget skarn and hematite-rich ore samples have a higher degree of susceptibility anisotropy than the other ore-types. Blötberget samples are dominated by multidomain characteristics in remanence, saturation and coercivity. High temperature measurements have shown that the magnetite is close to pure. The low temperature measurements suggest hematite is impure or bears a petrological footprint. The study also shows that rich iron ore samples sometimes can be at risk of being overlooked with standard methods of measuring susceptibility
Laboratorietekniska metoder kan användas som ett komplement till malmgeologi och geofysisk prospektering. I denna metodstudie karaktäriseras apatitjärnmalm från Blötberget, nära Grängesberg. En fyndighet bestående av linsformade malmkroppar rika på magnetit och ofta avskilda men komplexa hematitrika stråk. Studien är gjord 37 prover från totalt 8 borrkärnor, och lokaler som tillhörde produktion från gruvverksamhet under 1900-talet. Mätmetoderna fokuserar på att kartlägga malmens magnetiska egenskaper, och hur temperatur, frekvens, fältstyrka samt riktning påverkar dessa. Resultaten jämfördes med tidigare petrografisk studie av tillhörande tunnslip Resultaten visar att magnetit står för merparten av susceptibiliteten i proverna, men att även hematit kan urskiljas och kvantifieras. Temperaturberoende har påvisats vid övergångar för Verwey-temperatur; -153°C, Curie-temperatur; 580 °C, och Néeltemperatur; 680 °C. Den förväntade Morin-temperaturen vid -14°C, påträffades vid -60 °C eller saknas helt för flera av de hematitrika proverna. Magnetiskt anisotropa prover återfinns bland prover som identifierats som skarn eller hematitrika. Magnetisk granulometri visar karaktär av multidomäntyp med låg magnetisk coercivitet och hög satureringsförmåga. Högtemperaturmätningar av susceptibilitet visar på ren magnetit för prover från Blötberget. Samtidigt visar lågtemperaturemätningar att hematit sannolikt har inblandning av titanium eller bär på ett mer komplext förflutet. Studien visar också att det finns en risk i att enbart förlita sig på bulksusceptibilitet för prover rika på malm.
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Trutner, Sarah D. "An Investigation of AMS in Oman Ophiolite Gabbros." Oberlin College Honors Theses / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin1470493515.

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Seaux, Gage E. "Analog Modeling of Anisotropy of Magnetic Susceptibility as Affected by Pure Shear Strain on Original Magnetic Fabrics of Sedimentary Rocks." Thesis, University of Louisiana at Lafayette, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10683064.

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Analysis of the anisotropy of magnetic susceptibility (AMS) is an easy, non-destructive method to determine the preferred orientations of minerals in rocks and rock analogs. The orientations of the principal susceptibility axes (Kmax≥Kint≥Kmin) of the AMS ellipsoid are generally parallel to the principal axes of the strain ellipsoid (X≥Y≥Z). The orientations of the AMS axes as well as the magnitudes change in response to strain, though a generally accepted correlation between the magnitudes of the principal axes of AMS and strain has not yet been established. A successful correlation of the magnitudes of the principal susceptibility axes of AMS and strain would allow an easy and non-destructive method of quantitative strain analysis. This would also allow quantitative strain analyses of rocks where traditional methods using strain markers fail. In this study, the quantitative aspect of the relationship between strain and AMS is investigated experimentally using artificial mineral mixtures with a sedimentary initial magnetic fabric in an attempt to correlate strain to AMS. Mineral mixtures of magnetite, biotite, and specular hematite with a matrix of Art Time Dough® (similar to Playdoh®) were mixed separately. To create a random magnetic fabric, the samples were kneaded by hand for approximately 15 minutes. The samples were then strained to 70% strain in one direction to create a sedimentary initial magnetic fabric. The orientation of this strain became the Z axis of the strain ellipsoid. The samples were then strained perpendicular to this axis incrementally from 0% to 40% strain in 5% increments, with the AMS measured at each interval. The orientation of this strain became the Y axis of the strain ellipsoid. The data from these experiments resulted in the quantitative correlation of strain and AMS for the magnetite mineral mixtures. The biotite and specular hematite mixtures contain enough magnetite inclusions and magnetite conversion respectively to dominate the AMS. This creates a more complex relationship that is not easily correlated quantitatively to strain. The experiments demonstrate that a strong qualitative relationship exists between both the orientations and the magnitudes of the axes of the strain and AMS ellipsoids.

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Andersson, Magnus. "3D Structure and Emplacement of the Alnö Alkaline and Carbonatite Complex, Sweden : Integrated Geophysical and Physical Property Investigations." Doctoral thesis, Uppsala universitet, Geofysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-248113.

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Carbonatites are carbonate-rich magmatic rocks that are rare and of great relevance for our understanding of crustal and mantle processes. Although found on all continents and in settings ranging from Archaean to present-day, their deeper plumbing system is still poorly understood. Therefore, the main goal of this thesis is to broaden the existing knowledge of carbonatite systems, often limited to surface geological observations, by providing depth constraints using a number of geophysical methods and petrophysical measurements. The Alnö alkaline and carbonatite complex in central Sweden was chosen for this purpose. Data from three reflection seismic lines, ground gravity and magnetic measurements are presented. These data are complemented by a series of petrophysical measurements, including ultrasonic velocities, density, magnetic bulk susceptibility, anisotropy of magnetic susceptibility (AMS), and magnetic remanence, to aid in the interpretation of the geophysical data. The reflection seismic data indicate a solidified saucer-shaped fossil magma chamber at about 3 km depth. Caldera-style volcanism, constrained by surface geological observations, provides a plausible scenario to explain the emplacement of the complex, suggesting that carbonatite magmas have been stored, transported and erupted in a similar manner to known emplacement mechanisms for silicic calderas, although these are compositionally different. The AMS data from most of the carbonatite sheets in Alnö show a strong degree of anisotropy and oblate-shaped susceptibility ellipsoids. A set of syn- and post-emplacement processes that may control the AMS signature is evaluated based on the dataset. Overprinting of the primary flow patterns by processes related to sheet closure at the terminal stage of magma transport may explain the AMS observations. A complementary study using 3D inversion of ground gravity and aeromagnetic data was then carried out to better delineate the 3D internal architecture of the complex. Resulting models indicate a depth extent of the complex to about 3-4 km, consistent with the interpretation of the reflection seismic data. The modelling results of a ring-shaped magnetic anomaly observed in the Klingefjärden bay adjacent to Alnö Island further suggest that the complex may extend laterally about 3 km towards the north.
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Michlesen, Karen Joyce. "Heterogeneous internal fabric of the Mount Barcroft pluton, White Mountains, of eastern California: an anisotropy of magnetic susceptibility study." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/9720.

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Anisotropy of magnetic susceptibility (AMS) have been used with great success for determining the internal structure and fabrics of Jurassic and Cretaceous plutons of felsic-intermediate compositions in the White-Inyo Range of eastern California. However, application of the AMS techniques to the Mount Barcroft pluton, located in the northern White Mountains, has yielded anomalous scalar and directional AMS data indicative of unprecedented heterogeneity on the meter-kilometer scale. The 165 Ma Mount Barcroft pluton is primarily of granodiorite composition and was intruded into the Barcroft Structural Break, a northeast striking, steeply dipping structure that juxtaposes Mesozoic metavolcanic rocks to the north against Proterozoic-Paleozoic metasedimentary rocks to the south. Two oriented hand samples (A and B) were collected at each of 78 sites distributed on a 1 kilometer grid pattern across the 5 by 15 kilometer Mount Barcroft pluton and oriented cores were prepared from these hand samples for AMS analysis. Microstructure identification of single thin sections prepared for each sample site yielded primarily magmatic with minor solid-state structures. A highly heterogeneous distribution of scalar parameters (Km, P%, F%, L%, T) was documented both between sample sites and between the A and B cores at individual sites. The heterogeneity may be the result of complex mineral assemblages and the interaction between different magnetic mineral species ranging from single domain to pseudo-single domain to multidomain magnetite. More problematic are the directional parameters between A and B cores in orientation and fabric type (e.g. prolate and oblate susceptibility ellipsoids) occur which cannot be readily explained by a complex mineral assemblage. Different fabric types in A and B cores at individual sample sites could be the result of discrete, temporally unrelated, magma pulses of variable composition and viscosity. Heterogeneity of scalar and directional AMS parameters in the Mount Barcroft pluton, and its contrast with the homogeneous AMS signatures within similar age plutons to the south, may provide evidence for a previously unrecognized magma source beneath the northern White Mountains.
Master of Science
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Ridier, Karl. "Etudes des relations magnéto-structurales dans les composés à base moléculaire par diffusion des neutrons : des molécules individuelles aux nanoparticules." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112312/document.

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Un des enjeux majeurs dans le domaine du magnétisme moléculaire est de mieux comprendre et prévoir, dans les composés à base moléculaire, les corrélations qui existent entre les propriétés structurales (modulables à partir de méthodes de synthèse de type « bottom-up ») et les propriétés magnétiques. En particulier, la compréhension et la maîtrise de l’anisotropie magnétique à l’échelle locale est primordiale, notamment en vue de concevoir des molécules-aimants avec de plus hautes températures de blocage. Dans ce contexte, ce travail de thèse s’organise autour de deux grands axes. La première partie se concentre sur la détermination et la caractérisation de l’anisotropie magnétique locale dans des complexes moléculaires d’ions de transition de faible nucléarité. La diffraction de neutrons polarisés (PND) nous a permis, pour la première fois, de mettre clairement en évidence le tenseur de susceptibilité magnétique locale dans un complexe moléculaire mononucléaire de Fe3+ Bas-Spin ainsi que dans deux complexes, mononucléaire et dinucléaire, de Co2+ Haut-Spin. Cette approche novatrice mène à l’établissement de relations magnéto-structurales claires et directes, en reliant les directions magnétiques locales propres à l’environnement de coordination des ions métalliques et en particulier aux axes locaux de distorsion. Nous avons également mené l’étude originale d’un complexe à transition de spin thermo-induite de Mn3+ par diffusion inélastique de neutrons (INS) dans les deux phases Haut-Spin (HS) et Bas-Spin (BS). Cette étude nous a conduits à la proposition d’un modèle d’hamiltonien de spin anisotrope dans les deux états HS et BS, en relation avec la structure du complexe. Dans une seconde partie plus exploratoire de la thèse, nous avons mené une étude complète des propriétés structurales et magnétiques de nanoparticules ferromagnétiques d’analogue du bleu de Prusse CsNiCr, par diffusion de neutrons aux petits angles (SANS). Les effets de taille, d’organisation et de concentration sur leurs propriétés superparamagnétiques ont ainsi été clairement mis en évidence. En particulier, nous avons mis en exergue, pour les particules de plus petite taille (5 nm de diamètre), une contribution magnétique qui résulte de la manifestation d’un phénomène collectif, tandis que celles de plus grande taille (28 nm de diamètre) apparaissent être dans un état complètement multidomaine
One of the major issues in the field of molecular magnetism is to better understand and predict the correlations between the structural properties of molecule-based compounds and their magnetic properties, all of which may be tunable using “bottom-up” synthesis methods. In particular, the understanding and control of the magnetic anisotropy at the atomic scale is essential, especially with the aim to design Single-Molecule Magnets (SMM) with higher blocking temperatures. In this context, this thesis work is focused on two mains subjects. The first part deals with the determination and the characterization of the local magnetic anisotropy in low-nuclearity molecular complexes based on transition ions. Polarised neutron diffraction (PND) allows us, for the first time, to directly access the local susceptibility tensor in a Low-Spin Fe3+ mononuclear complex as well as in two, mononuclear and dinuclear, High-Spin Co2+ complexes. This innovative approach leads to the establishment of unique and direct magneto-structural correlations, by relating the local magnetic principal directions with the coordination environment of the metallic ions and, in particular, with the local distortion axes. We have also carried out an original investigation by inelastic neutron scattering (INS) of a Mn3+ thermo-induced spin-transition compound in both High-Spin (HS) and Low-Spin (LS) states. On the basis of this study, we were able to propose an anisotropic spin-Hamiltonian model in both HS and LS phases, and their relationships with the structure of the molecule are discussed. In a second more exploratory part of the thesis, we have carried out by small-angle neutron scattering (SANS) a complete study of the structural and magnetic properties of Prussian blue analogues (PBA) ferromagnetic nanoparticles CsNiCr. The effects of size, organization and concentration on their superparamagnetic properties have been clearly highlighted. In particular, a strong magnetic contribution has been observed for the smallest particles (5 nm diameter) which results from the manifestation of a collective process, while the biggest (28 nm diameter) appear to be in a multi-domain state
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Humbert, Fabien. "Analyse pétrophysique et anisotropie de roches détritiques dans des systèmes compressifs en présence de failles actives : exemple des prismes de Taiwan et de Nankai." Thesis, Cergy-Pontoise, 2010. http://www.theses.fr/2010CERG0480/document.

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Analyse pétrophysique et anisotropie des roches détritiques dans des systèmes en compression et sous influence de failles actives : Exemple des prismes de Taiwan et du prisme de Nankai (Japon)L'objectif de cette thèse est l'étude de la déformation enregistrée par des roches d'origine détritique dans des domaines sujets au raccourcissement tectonique sub-horizontal (Layer Parallel Shortening) et à des failles actives. Cette étude est basée sur la caractérisation de diverses propriétés physiques et de leur anisotropie à l'échelle de l'échantillon dans le but de décrire à plus grande échelle la structure d'un prisme d'accrétion. Deux prismes ont ainsi été échantillonnés, le premier est le prisme inactif de Taiwan dans le cadre du projet TCDP et le second considéré comme actif celui de Nankai dans le cadre du projet NanTroSeiZE. La microstructure d'une roche sédimentaire, y compris en l'absence de déformation tectonique, présente toujours une ou plusieurs caractéristique(s) anisotrope(s) liée(s) à la forme, à l'orientation préférentielle ou à l'arrangement de ses éléments constitutifs. De nombreux travaux ont porté sur les conséquences de ces anisotropies sur les propriétés physiques, d'abord dans un but prédictif, puis selon une démarche inverse visant à caractériser, à l'aide de modèles, microstructures et histoire tectonique associée. Dans cette thèse la confrontation des résultats obtenus pour différentes propriétés physiques (principalement vitesses des ondes acoustiques, susceptibilité magnétique et aimantation rémanente) met en évidence des réponses sélectives liées à un fort contrôle de la lithologie.Au niveau de prisme de Taiwan, deux résultats majeurs ont été obtenus. D'une part, la comparaison des anisotropies magnétiques et acoustiques a permis de montrer une évolution différentielle de la déformation entre les roches riches en matrice (siltite) par et celles plus riches en grain sableux (grès). D'autre part, les résultats combinés de l'anisotropie des ondes P, l'étude microstructurale et la minéralogie magnétique, montrent un comportement particulier des échantillons situé dans le mur de la faille FZB1136, considérée comme responsables du séisme de Chi-Chi en 1999. Un réseau de structures dilatantes fortement perméable à permis la circulation de fluides, de néo-cristallisation de calcite et de néoformation de minéraux magnétique. Sur le prisme de Nankai, une estimation de la quantification de la déformation enregistrée par les échantillons du prisme est modélisée en utilisant le modèle de March et les paramètres de susceptibilité magnétique. Les différents travaux réalisés dans cette thèse mettent en évidence un couplage direct de certaines propriétés physiques mesurées avec certains effets de déformation, chaque propriété caractérisant un point précis de la fabrique enregistré dans les roches.Mots-clefs : Anisotropie, susceptibilité magnétique, vitesses d'ondes ultrasoniques, déformation, fabrique, microstructures, faille inverse, TCDP, NanTroSeiZE
Petrophysics of sedimentary rocks in compressive regime near active faults: examples of the Taiwan and Nankai accretionary prismsThe objective of this PhD is to study the deformation recorded by detrital rocks in areas subject to sub-horizontal tectonic shortening (Layer Parallel Shortening) and active faults. This study is based on the characterization of various physical properties and their anisotropy at sample scale in order to describe larger-scale structure of an accretionary prism. Two prisms have been sampled, the first is the inactive in Taiwan prism (TCDP project) and the second active the Nankai prism (NanTroSeiZE project).Sedimentary rocks microstructures, regardless of the degree to which they were loaded tectonically, always present some anisotropic characteristic emerging from a preferential shape, orientation or distribution of its constituents. Numerous studies have focused on the effect of such anisotropies on physical properties, first for prediction purposes, then to conversely get diffuse strain insight through the use of various effective medium models. In this thesis, the comparison between results obtained in discrete samples for various physical properties (essentially acoustic wave velocities, magnetic susceptibility and remanent magnetization) reveals selective responses due to a strong lithologic control.In TCDP, two significant results are reported. On the one hand, comparison of magnetic and acoustic anisotropy showed a differential evolution of deformation between the matrix-rich rocks (siltstones) and those with coarser granular fraction (sandstone). On the other hand, the combined results of the anisotropy of P waves velocity, microstructural analysis and magnetic mineralogy, show a peculiar behavior of the samples located in the wall of the fault FZB1136, considered to be responsible of the Chi-Chi earthquake in 1999. A network of highly permeable dilatant structures allowed the circulation of fluids, neo-crystallization of calcite and neoformation of magnetic minerals. On the Nankai prism, an estimate of quantifying the deformation recorded by the samples of the prism is modeled using a simple March-type model and the parameters of magnetic susceptibility. The various work in this thesis show a direct coupling of physical properties measured with some aspect of deformation, each property characterizing a specific point of the fabric recorded in rocks.Keywords : Anisotropy, magnetic susceptibility, ultrasonic wave velocity, strain, fabric, microstructures, thrust fault, TCDP, NanTroSeiZE
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Books on the topic "Anisotropy of magnetic susceptibility"

1

Gupta, R. R., ed. Diamagnetic Susceptibility and Magnetic Anisotropy of Organic Compounds. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44736-8.

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Haley, Richard Peter. NMR investigation of the magnetic susceptibility anisotropy in the A phase of 3He. Manchester: University of Manchester, 1995.

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L, Reynolds Richard, Meyer Robert, and Geological Survey (U.S.), eds. Paleomagnetism of Pleistocene sediments from drill hole OL-92, Owens Lake, California: Reevaluation of magnetic excursions using anisotropy of magnetic susceptibility. Denver, Colo: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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Porter, Eithne Mary. Anisotrophy of magnetic susceptibility in the Criffel-Dalbeattie pluton, Scotland: Implications for emplacement mechanism. Birmingham: University of Birmingham, 2002.

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Tarling, D. H. The magnetic anisotropy of rocks. London: Chapman & Hall, 1993.

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Dahlin, D. C. Magnetic susceptibility of minerals in high magnetic fields. Washington, DC: U.S. Dept. of the Interior, Bureau of Mines, 1993.

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Gupta, R. R., ed. Diamagnetic Susceptibility and Anisotropy of Inorganic and Organometallic Compounds. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-44694-1.

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Hussain, T. Magnetic anisotropy studies of TbFe thin films. Salford: University of Salford, 1990.

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F, Martín-Hernández, and Geological Society of London, eds. Magnetic fabric: Methods and applications. London: Geological Society, 2004.

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Satter, Md Abdus. A theory for dilute magnetic alloys: The origin of magnetic anisotropy. [s.l.]: typescript, 1989.

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Book chapters on the topic "Anisotropy of magnetic susceptibility"

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Dubey, Ashok Kumar. "Anisotropy of Magnetic Susceptibility." In Understanding an Orogenic Belt, 17–34. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05588-6_2.

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Kumar, M., and R. Gupta. "Magnetic anisotropy data of CBrN." In Diamagnetic Susceptibility and Magnetic Anisotropy of Organic Compounds, 313. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44736-8_245.

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Kumar, M., and R. Gupta. "Magnetic anisotropy data of CClFO." In Diamagnetic Susceptibility and Magnetic Anisotropy of Organic Compounds, 314. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44736-8_246.

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Kumar, M., and R. Gupta. "Magnetic anisotropy data of CCl15N." In Diamagnetic Susceptibility and Magnetic Anisotropy of Organic Compounds, 315. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44736-8_247.

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Kumar, M., and R. Gupta. "Magnetic anisotropy data of CF15N." In Diamagnetic Susceptibility and Magnetic Anisotropy of Organic Compounds, 316. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44736-8_248.

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Kumar, M., and R. Gupta. "Magnetic anisotropy data of CF2O." In Diamagnetic Susceptibility and Magnetic Anisotropy of Organic Compounds, 317. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44736-8_249.

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Kumar, M., and R. Gupta. "Magnetic anisotropy data of CHClO." In Diamagnetic Susceptibility and Magnetic Anisotropy of Organic Compounds, 318. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44736-8_250.

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Kumar, M., and R. Gupta. "Magnetic anisotropy data of CHFO." In Diamagnetic Susceptibility and Magnetic Anisotropy of Organic Compounds, 319. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44736-8_251.

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Kumar, M., and R. Gupta. "Magnetic anisotropy data of CHF3." In Diamagnetic Susceptibility and Magnetic Anisotropy of Organic Compounds, 320. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44736-8_252.

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Kumar, M., and R. Gupta. "Magnetic anisotropy data of CHI3." In Diamagnetic Susceptibility and Magnetic Anisotropy of Organic Compounds, 321. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44736-8_253.

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Conference papers on the topic "Anisotropy of magnetic susceptibility"

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Liu, Zhuo, and Yaoguo Li. "Inversion for anisotropy magnetic susceptibility." In SEG Technical Program Expanded Abstracts 2020. Society of Exploration Geophysicists, 2020. http://dx.doi.org/10.1190/segam2020-3428248.1.

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Zhuravlev, V. A., and V. A. Meshcheryakov. "Magnetic susceptibility tensor of the composite material consisting of single-domain magnetic particles with uniaxial magnetic anisotropy." In 2014 24th International Crimean Conference "Microwave & Telecommunication Technology" (CriMiCo). IEEE, 2014. http://dx.doi.org/10.1109/crmico.2014.6959592.

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Heij, Gerhard, Doug Elmore, Jennifer Roberts, Alex K. Steullet, Shannon Dulin, and Sarah Friedman. "Anisotropy of Magnetic Susceptibility: A Petrofabric Tool to Measure the Fabric of Shales." In Unconventional Resources Technology Conference. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/178663-ms.

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Richards, Rebecca, Timothy Williams, David B. Hacker, and Scott Giorgis. "ANISOTROPY OF MAGNETIC SUSCEPTIBILITY ANALYSIS SAMPLES FROM THE PINE VALLEY MOUNTAIN LACCOLITH, SOUTHWESTERN UTAH." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-319130.

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Sortan, S., C. Panaiotu, D. Dimofte, and R. Roban. "Paleoflow Directions Measurements Using Anisotropy of Magnetic Susceptibility: A Case Study – East Carpathians, Romania." In 80th EAGE Conference and Exhibition 2018. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201801677.

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Liu, Zhuo, and Yaoguo Li. "Effect of anisotropic magnetic susceptibility and potential applications." In SEG Technical Program Expanded Abstracts 2018. Society of Exploration Geophysicists, 2018. http://dx.doi.org/10.1190/segam2018-2997835.1.

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Li, X., S. Dong, T. Yoo, X. Liu, M. Dobrowolska, and J. K. Furdyna. "Anisotropic ac magnetic susceptibility in (Ga, Mn)As film." In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7156853.

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Mekkawi, Mahmoud, Ahmed Saleh, and Ahmed Ismail. "Determining the Basaltic Flow Direction at El Minya Area in Egypt Using Magnetic and Anisotropy of Magnetic Susceptibility Measurements." In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2012. Environment and Engineering Geophysical Society, 2012. http://dx.doi.org/10.4133/1.4721796.

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Kone, Bakary, Michael Petronis, and Jennifer Lindline. "EMPLACEMENT OF THE CERROS DEL RIO INTRUSION BASED ON ANISOTROPY OF MAGNETIC SUSCEPTIBILITY, PALEOMAGNETIC, MAGNETIC SURVEY, PETROLOGICAL, AND PHOTOGRAMMETRY DATA." In Joint 70th Annual Rocky Mountain GSA Section / 114th Annual Cordilleran GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018rm-314111.

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Warbritton, Matthew J., and Neal R. Iverson. "STRAIN PATTERNS IN THE RUBJERG KNUDE GLACIOTECTONIC COMPLEX, DENMARK: A STUDY USING ANISOTROPY OF MAGNETIC SUSCEPTIBILITY." In 52nd Annual North-Central GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018nc-312265.

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Reports on the topic "Anisotropy of magnetic susceptibility"

1

Ernst, R. E., and G. W. Pearce. Averaging of Anisotropy of Magnetic Susceptibility Data. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/128071.

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Benn, K., M. Genkin, C. R. van Staal, and S. Lin. Structure and anisotropy of magnetic susceptibility of the Rose Blanche Granite, southwestern Newfoundland: kinematics and relative timing of emplacement. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/134273.

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Pechan, M. J. Magnetic multilayer interface anisotropy. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/5158883.

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Pechan, M. J. Magnetic multilayer interface anisotropy. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/6958467.

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Pechan, M. J. Magnetic multilayer interface anisotropy. Office of Scientific and Technical Information (OSTI), January 1990. http://dx.doi.org/10.2172/6554380.

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Toney, Michael F. High Anisotropy CoPtCrB Magnetic Recording Media. Office of Scientific and Technical Information (OSTI), June 2003. http://dx.doi.org/10.2172/813356.

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Hellman, Frances. Sources of Anisotropy in Amorphous Magnetic Thin Film. Fort Belvoir, VA: Defense Technical Information Center, April 1992. http://dx.doi.org/10.21236/ada252296.

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Hellman, Frances. Sources of Anisotropy in Amorphous Magnetic Thin Films. Fort Belvoir, VA: Defense Technical Information Center, November 1990. http://dx.doi.org/10.21236/ada230542.

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Diaz, J., N. M. Hamdan, P. Jalil, Z. Hussain, S. M. Valvidares, and J. M. Alameda. Understanding the magnetic anisotropy in Fe-Si amorphous alloys. Office of Scientific and Technical Information (OSTI), August 2002. http://dx.doi.org/10.2172/820783.

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Vannette, Matthew Dano. Dynamic magnetic susceptibility of systems with long-range magnetic order. Office of Scientific and Technical Information (OSTI), January 2009. http://dx.doi.org/10.2172/976275.

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