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Dissertations / Theses on the topic 'Magnetism and magnetic materials'

Author: Grafiati
Published: 4 June 2025
Last updated: 1 August 2025

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1

Fan, Yichun. "Optical Characterization of Magnetism in Magnetic/Nonmagnetic Heterostructures." W&M ScholarWorks, 2013. https://scholarworks.wm.edu/etd/1539623362.

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This thesis focuses on the study of the static and dynamic magnetic interactions in ferromagnetic/nonmagnetic heterostructures using interface-specific and time-resolved optical techniques. The goal of this thesis is to elucidate the interface exchange coupling, magnetic anisotropy, and coherent spin dynamics in these advanced material systems, crucial to the realization of high performance spintronic devices.;First, a pronounced exchange bias (EB) phenomenon is observed in Fe/MgO (001) by magnetic second harmonic generation. The bulk magnetization does not, in marked contrast to typical syste
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2

Raanaei, Hossein. "Tailoring Properties of Materials at the Nanoscale." Doctoral thesis, Uppsala : Uppsala University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-107425.

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3

Thanaboonsombut, Buncha. "An investigation of magnetically induced defect recovery in ferromagnetic nickel." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/17041.

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4

Chakraborty, Arnab. "Magnetism of Nanocrystallized Amorphous Fe75B10Si15." Thesis, KTH, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-107191.

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Amorphous ribbons of alloy composition Fe75B10Si15 are cast by melt spinning and annealed to partially nanocrystalline states. The magnetic properties are investigated by VSM and MTGA. Structure is examined using XRD and SEM. Results obtained show nanostructured material with excellent soft magnetism in samples annealed at temperatures below the crystallization temperature as well as enhancement of magnetic hardness for annealing at high temperatures. This validates Herzer’s Random Anisotropy model of magnetism in nanostructured materials and provides basis for further inquiry into tweaking al
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5

Costa, Marcio. "First-principles Studies of Local Structure Effects in Magnetic Materials." Doctoral thesis, Uppsala universitet, Materialteori, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-179223.

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This thesis focus on the magnetic behavior, from single atoms to bulk materials. The materials considered in this thesis have been studied by computational methods based on ab initio theory, density functional theory (DFT), including treatment of the spin-orbit coupling, non-collinear magnetism, and methods capable of treating discorded systems. Furthermore strongly correlated materials have been investigated using the dynamical mean field theory (DMFT). The uniaxial magnetic anisotropy energy (MAE) of the Fe2P was investigated using the full-potential linear muffin tin orbital (FP-LMTO) metho
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6

Murakami, Regina Keiko. ""Novos materiais magnéticos para imãs de alta performance"." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-14022006-182556/.

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O objetivo do presente trabalho foi desenvolver novos materiais magnéticos para ímãs de alta performance. Duas classes de materiais foram estudadas: materiais a base de (Nd,Sm)5(Fe,MT)17, onde MT é um metal de transição, e materiais nanocristalinos a base de (Nd,Pr)FeB com adições de TiC. As ligas (Nd,Sm)5(Fe,MT)17 foram preparadas por fusão em forno de arco e posteriormente foram tratadas termicamente por longos períodos (no mínimo 30 dias). Tentamos melhorar as propriedades magnéticas por meio de substituições químicas (Ti, Co, Mn, etc.) e/ou por introdução intersticial de deutério ou nit
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7

Bhuiya, Abdul Wazed. "Temperature-induced phenomena in systems of magnetic nanoparticles." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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8

Riley, Melissa Alessandra. "The use of magnets in biomedical applications." Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364498.

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9

Venkataramana, Vikash. "Neutrons to probe nanoscale magnetism in perpendicular magnetic recording media." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3187.

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Magnetic recording media refers to the disc shaped thin film magnetic medium present inside the hard disk drive of a computer. Magnetic recording is an important function of the hard disk drive by which information such as text, pictures, audio and videos are stored. Information is broken down to a simple binary format and is stored as magnetised bits along the tracks of the disk forming the hard drive. Over the years advancements in research on the type of magnetic materials used has allowed increased data storage capacities by reducing magnetic bit sizes. It is with this advancement in magne
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10

Wilman, James. "Magnetic resonance of paramagnetically doped materials." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/39618/.

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Colloidal quantum dots (QDs) allow for the tuning of dopant concentration as well as flexibility in the engineering of the surrounding medium. This thesis explores the use of magnetic resonance techniques and the development of hardware in order to characterize paramagnetically doped materials, in particular Mn-doped PbS colloidal QDs, and assess their potential for applications in quantum technologies such as quantum information processing (QIP). Colloidal PbS:Mn QDs capped with thioglycerol/dithiolglycerol ligands were synthesised in aqueous solution. Methods of tailoring the Mn-Mn and Mn-1H
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11

Etzkorn, Stephen J. "Magnetic relaxation in organic-based magnets." Connect to this title online, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1044548603.

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Thesis (Ph. D)--Ohio State University, 2003.<br>Title from first page of PDF file. Document formatted into pages; contains xvi, 134 p. : ill. (some col.). Includes abstract and vita. Advisor: Arthur J. Epstein, Dept. of Physics. Includes bibliographical references (p. 128-134).
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12

Soroka, Inna. "Magnetic Heterostructures : The Effect of Compositional Modulation on Magnetic Properties." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5733.

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13

Han, Man Huon. "Development of synthesis method for spinel ferrite magnetic nanoparticle and its superparamagnetic properties." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26465.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2009.<br>Committee Chair: Z. John Zhang; Committee Member: Angus Wilkinson; Committee Member: C P Wong; Committee Member: E. Kent Barefield; Committee Member: Mostafa El-Sayed. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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14

Stanciu, Victor. "Magnetism of Semiconductors and Metallic Multilayers." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5844.

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15

Altarawneh, Moaz. "High frequency probes of superconductivity and magnetism in anisotropic materials in very high magnetic field." Tallahassee, Florida : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-10142009-142552/.

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Thesis (Ph. D.)--Florida State University, 2009.<br>Advisor: James Brooks, Florida State University, College of Arts and Sciences, Dept. of Physics. Title and description from dissertation home page (viewed on May 3, 2010). Document formatted into pages; contains xiii, 118 pages. Includes bibliographical references.
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16

Cedervall, Johan. "Magnetic Materials for Cool Applications : Relations between Structure and Magnetism in Rare Earth Free Alloys." Doctoral thesis, Uppsala universitet, Institutionen för kemi - Ångström, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-331762.

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New and more efficient magnetic materials for energy applications are a big necessity for sustainable future. Whether the application is energy conversion or refrigeration, materials based on sustainable elements should be used, which discards all rare earth elements. For energy conversion, permanent magnets with high magnetisation and working temperature are needed whereas for refrigeration, the entropy difference between the non-magnetised and magnetised states should be large. For this reason, magnetic materials have been synthesised with high temperature methods and structurally and magnet
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17

Burkert, Till. "Materials for Magnetic Recording Applications." Doctoral thesis, Uppsala University, Department of Physics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5800.

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<p>In the first part of this work, the influence of hydrogen on the structural and magnetic properties of Fe/V(001) superlattices was studied. The local structure of the vanadium-hydride layers was determined by extended x-ray absorption fine structure (EXAFS) measurements. The magnetic ordering in a weakly coupled Fe/V(001) superlattice was investigated using the magneto-optical Kerr effect (MOKE). The interlayer exchange coupling is weakened upon alloying with hydrogen and a phase with short-range magnetic order was observed.</p><p>The second part is concerned with first-principles calculati
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18

Lawson, Graham Richard. "Swept frequency absorption in particulate magnetic materials." Thesis, Manchester Metropolitan University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296486.

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19

Knut, Ronny. "New Materials for Spintronics : Electronic structure and magnetism." Doctoral thesis, Uppsala universitet, Yt- och gränsskiktsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-167415.

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Materials exhibiting new functionalities due to interdependent electric (e.g. conductivity) and magnetic properties are potentially interesting for spintronics applications. We have investigated electronic and magnetic properties by means of x-ray spectroscopies and SQUID magnetometry in several magnetic materials, often in the form of thin films, which have shown promising properties for applications. One of the main subjects has been studies of inter-diffusion between layers in multilayer structures, which is an important factor for spin-dependent transport and magnetic properties. These stu
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20

Vela, Llausí Sergi. "Computational Modeling of Molecular Magnetic Materials." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/285357.

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Molecular materials have raised much interest in the last decades in the quest for new multifunctional devices. Among the multiple properties that those materials may present, one of the most typical is magnetism, which arises from the presence of unpaired electrons in the molecules that constitute the three-dimensional crystal. Magnetism has a macroscopic observable, the magnetic susceptibility (Ji), which is usually rationalized in terms of a set of JAB magnetic interactions between pairs of molecules. However, any experimental technique allows for such direct correspondence and, thus, the e
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21

Patel, Anup. "Pulsed field magnetization of composite superconducting bulks for magnetic bearing applications." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/256579.

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Permanent magnets are essential components for many devices such as motors, which currently account for 45 % of global electricity consumption, generators and also superconducting magnetic bearings used for applications such as flywheel energy storage. But even the most powerful rare-earth magnets are limited to a remanent field of 1.4 T, whereas superconducting materials such as YBCO in their bulk form have the extraordinary ability to trap magnetic fields an order of magnitude higher, whilst being very compact. This gives them the potential to increase efficiency and allow significant volume
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22

Miranda, Ivan de Paula. "Propriedades magnéticas de trímeros de FexCo1-x depositados em Pt(111)." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-31052016-134418/.

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Quais propriedades magnéticas são modificadas quando se agrupam átomos de Fe/Co para formar estruturas quasi-2D, se comparadas aos nanofios (quasi-1D) de FexCo1-x? E como estas propriedades reagem com a variação da proporção de Fe/Co nos aglomerados? A fim de responder a estas questões, trímeros de FexCo1-x depositados em Pt(111) são investigados utilizando o método de primeiros princípios Real Space-Linear Muffin-Tin Orbital-Atomic Sphere Approximation (RS-LMTO-ASA) no âmbito da Teoria do Funcional da Densidade (DFT). Diferentes configurações de trímeros triangulares são consideradas, variand
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23

Foronda, Francesca. "Muon spin spectroscopy and high magnetic field studies of novel superconductors and magnetic materials." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:55c7ed6b-af31-4b7b-8b64-217dcc6846ac.

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This thesis investigates a number of novel magnetic materials and high temperature superconductors using high-field magnetometry and muon spin spectroscopy (&mu;SR). The main measurement techniques are briefly described and a study of the dimer material [Cu(pyrazine)(glycine)]ClO<sub>4</sub> is presented to demonstrate the use of the proximity detector oscillator as a susceptometer in high magnetic fields. &mu;SR is a highly effective tool for probing magnetic order, spin freezing and spin dynamics. However, in some circumstances its performance may be impaired by the extent to which it pertur
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24

Pulham, R. J. "High resolution thermal expansion studies of some magnetic materials." Thesis, University of Southampton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382186.

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25

Korelis, Panagiotis. "Uncovering Magnetic Order in Nanostructured Disordered Materials : A Study of Amorphous Magnetic Layered Structures." Doctoral thesis, Uppsala universitet, Materialfysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-159913.

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The scope of this thesis is the study of the interplay between structure and magnetism in amorphous materials. The investigations focus on the growth of amorphous layers and the study of the influence of structural disorder and reduced physical extension on the magnetic properties of thin films and multilayers. The examined magnetic materials are FeZr alloys, as well as other amorphous transition metal alloys such as CoZr and FeCoZr. Thin films and multilayers of the studied materials were deposited using magnetron sputtering in ultra-high vacuum conditions. Their amorphous structure and layering
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26

Vaughan, Lisa Ann. "Enviromentally benign synthesis and application of some spinel ferrite nanopartilces." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/44876.

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In this thesis, the commercial viability of the aminolytic synthesis method is explored through robustness, versatility, and waste reduction studies. We report the preparation of metal precursors and the development of a synthetic approach using an aminolytic reaction of metal carboxylates in oleylamine and non-coordinating solvent. Manganese doping in the cobalt ferrites allows for the investigation of the couplings. All the compositions in the series Co1-xMnxFe2O4, 0.0  x  1.0 were synthesized via the aminolytic reaction. The coercivity decreases with increasing Mn2+ concentration due
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27

Cedervall, Johan. "Structure-Magnetism Relations in Selected Iron-based Alloys : A New Base for Rare Earth Free Magnetic Materials." Licentiate thesis, Uppsala universitet, Institutionen för kemi - Ångström, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-267575.

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Materials for energy applications are of great importance for a sustainable future society. Among these, stronger, lighter and more efficient magnetic materials will be able to aid mankind in many applications for energy conversion, for example generators for energy production, electric vehicles and magnetic refrigerators. Another requirement for the materials is that they should be made from cheap and abundant elements. For these reasons temperature induced magnetic transitions for three materials were studied in this work; one for permanent magnet applications and two magnetocaloric material
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28

Belyea, Dustin David. "Analysis of Critical Behavior in Magnetic Materials." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5180.

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This work contains a broad study of a variety of magnetic materials undergoing second order phase transitions. In general this leads to an overall increase in information and analytical methods to further the field of magnetocalorics. Specifically, critical aspects of magnetocaloric materials were compared within systems in relation to structure, stoichiometry, magnetic minority phases and magnetic contaminants. Detailed analyses were developed to quantify techniques which were in the past used mainly in a qualitative way, leading to a more complete understanding of how critical phenomena impa
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29

Diaz, Begoña Ruiz. "Magnetic properties of granular magnetic materials." Thesis, University of York, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428429.

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30

Labarta, Amílcar. "Estudio de las propiedades magnéticas de ftalocianinas y sistemas ferromagnéticos diluidos." Doctoral thesis, Universitat de Barcelona, 1985. http://hdl.handle.net/10803/665977.

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Los trabajos de esta memoria persiguen un doble objetivo. Por un lado se ha pretendido ahondar en modelos de campo cristalino para cationes 3d(n) y su correlación con los datos experimentales, de sustancias de interés catalítico y básico. En segundo lugar, se trataba de iniciar un estudio amplio y ambicioso sobre sistemas desordenados. En esta Tesis hemos estudiado sistemas ferromagnéticos diluídos y se han utilizado modelos de campo medio y de simulación Monte Carlo para determinar diferentes magnitudes macroscópicas, a la vez que contestar a ciertas preguntas fundamentales, referidas al comp
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31

Stumpe, Laura. "Magnetic structure factor for MnTe/ZnTe semiconductor superlattices /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p3099642.

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32

DeGeorge, Vincent G. "Chemical Partitioning and Resultant Effects on Structure and Electrical Properties in Co-Containing Magnetic Amorphous Nanocomposites for Electric Motors." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/885.

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chemical partitioning of Cobalt-containing soft magnetic amorphous and nanocomposite materials has been investigated with particular focus on its consequences on these materials’ nanostructure and electrical resistivity. Theory, models, experiment, and discussion in this regard are presented on this class of materials generally, and are detailed in particular on alloys of composition, (Fe65Co35)79.5+xB13Si2Nb4-xCu1.5, for X={0- 4at%}, and Co-based, Co76+YFe4Mn4-YB14Si2Nb4, for Y={0-4at%}. The context of this work is within the ongoing efforts to integrate soft magnetic metal amorphous and nano
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33

Backer-Meurke, Fredrik. "Finite-size effect in CoAlZr/AlZr multilayers." Thesis, Uppsala universitet, Materialfysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355721.

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The structural and magnetic properties of amorphous Cox(Al80Zr20)1-x multilayers with varying thicknesses of the magnetic bilayers have been investigated. The reduction of the thickness causes a reduction of the critical temperature, Tc, this is known as the finite-size effect. The multilayers were grown using DC magnetron sputtering, co-sputtering was used with cobalt and an Al80Zr20 alloy target to create an amorphous CoAlZr alloy. The total thickness of the multilayers was chosen to be held constant at 60 nm and the Al80Zr20 spacing layers were thick enough to suppress any interlayer exchan
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34

Scozzaro, Nicolas Joseph. "Ultrasensitive Measurements of Magnetism in Carbon-based Materials." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu148059474280115.

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35

Pessotto, Gerson de Carli Proença de Almeida. "Propriedades magnéticas de filmes nanoestruturados de FeRh e FeRh/Fe." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-20112014-105404/.

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As ligas de FeRh apresentam um comportamento não usual quando encontradas próximas da composição equiatômica, sendo observada uma transição de fase magnetoestrutural de primeira ordem, na qual o sistema passa de um estado antiferromagnético para um estado ferromagnético com a temperatura crítica próxima da temperatura ambiente. A temperatura crítica de transição é fortemente dependente da composição da liga, das técnicas de produção e dimensionalidade da amostra, além de fatores externos como pressão e campo magnético. No presente trabalho foram depositados, via magnetron sputtering, filmes de
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36

Banfield, Zoë F. "Magnetic Compton scattering of magnetic and coexistent magnetic and superconducting materials." Thesis, University of Warwick, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425533.

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37

Eves, Daniel Patrick. "Materials for magnetic MEMS." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612715.

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38

Sabo, Daniel E. "Novel synthesis of metal oxide nanoparticles via the aminolytic method and the investigation of their magnetic properties." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50122.

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Metal oxide nanoparticles, both magnetic and nonmagnetic, have a multitude of applications in gas sensors, catalysts and catalyst supports, airborne trapping agents, biomedicines and drug delivery systems, fuel cells, laser diodes, and magnetic microwaves. Over the past decade, an inexpensive, simple, recyclable, and environmentally friendly large, scale synthesis method for the synthesis of these metal oxide nanoparticles has been sought. Many of the current techniques in use today, while good on the small, laboratory bench scale, suffer from drawbacks that make them unsuitable for the indust
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39

Yanmin, Wang. "Wet magnetic concentration for weakly magnetic mineral fines and ultrafines." Doctoral thesis, Luleå, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26710.

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The first objective of the thesis was to reveal the characteristic magnetic behaviour of natural weakly magnetic minerals (such as hematite and chromite), and the size limits of the particles recoverable by the existing modem high intensity and high gradient magnetic separators. The second objective was to enhance the particle aggregation andlor the magnetic response for wet magnetic concentration of the ultrafines which escaped from the separators. It was observed that weakly magnetic natural minerals (hematite and chromite) exhibited variations in the magnetic behaviour with respect to magne
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40

ATZORI, MATTEO. "Anilate-based Functional Molecular Materials with Conducting and Magnetic Properties." Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266558.

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This work reports on the design, synthesis and characterization of novel anilate-based functional molecular materials showing magnetic and conducting properties. The family of anilate ligands comprises several derivatives obtained by introducing various substituents (H, F, Cl, Br, I, CN, Me, NO2, etc.) at the 3 and 6 positions of a common 2,5-dihyroxy- 1,4-benzoquinone framework. Their electronic/structural features, coordination modes and ability to mediate magnetic exchange interactions between coordinated metal centers make them suitable candidates for the preparation of the above-men
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41

Tsai, I.-Ling. "Magnetic properties of two-dimensional materials : graphene, its derivatives and molybdenum disulfide." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/magnetic-properties-of-twodimensional-materials-graphene-its-derivatives-and-molybdenum-disulfide(59dcba1b-332e-4a58-86f6-80ed56c7fdd1).html.

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Graphene, an atomically thin material consisting of a hexagonal, highly packed carbon lattice, is of great interests in its magnetic properties. These interests can be categorized in several fields: graphene-based magnetic materials and their applications, large diamagnetism of graphene, and the heterostructures of graphene and other two dimensional materials. In the first aspect, magnetic moments can be in theory introduced to graphene by minimizing its size or introducing structural defects, leading to a very light magnetic material. Furthermore, weak spin-orbital interaction, and long spin
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42

Sampaio, Guilherme Moisés. "Nanopartículas magnéticas: simulações para o regime superparamagnético." Universidade Federal de São Carlos, 2016. https://repositorio.ufscar.br/handle/ufscar/8257.

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Submitted by Milena Rubi (milenarubi@ufscar.br) on 2016-11-03T17:25:54Z No. of bitstreams: 1 SAMPAIO_Guilherme_2016.pdf: 12947275 bytes, checksum: e37468f50e4625a4fdc9875a5cf3f85f (MD5)<br>Approved for entry into archive by Milena Rubi (milenarubi@ufscar.br) on 2016-11-03T17:26:13Z (GMT) No. of bitstreams: 1 SAMPAIO_Guilherme_2016.pdf: 12947275 bytes, checksum: e37468f50e4625a4fdc9875a5cf3f85f (MD5)<br>Approved for entry into archive by Milena Rubi (milenarubi@ufscar.br) on 2016-11-03T17:26:21Z (GMT) No. of bitstreams: 1 SAMPAIO_Guilherme_2016.pdf: 12947275 bytes, checksum: e37468f50e4625a
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Brunet, Gabriel. "Molecular Engineering of Metal-Organic Assemblies: Advances Toward Next Generation Porous and Magnetic Materials." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40385.

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The controlled assembly of molecular building blocks is an emerging strategy that allows for the preparation of materials with tailor-made properties. This involves the precise combination of molecular subunits that interact with one another via specifically designed reactive sites. Such a strategy has produced materials exhibiting remarkable properties, including those based on metal-organic frameworks and single-molecule magnets. The present Thesis aims to highlight how such metal-organic assemblies can be engineered at the molecular level to promote certain desired functionalities. Specific
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44

Stangel, Anders. "Magnetocrystalline Anisotropy in(FexNi1-x)2B Materials." Thesis, Uppsala universitet, Materialteori, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-301992.

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The magnetic properties of the (FexNi1-x)2B family of materials are explored using DFT calculations utilizing the FPLO and SPR-KKR code packages. It is found that a uniaxial magnetocrystalline anisotropy exists at around x = 0.8 with a magnetocrystalline anisotropy energy at around 0.3 MJ/m^3. A calculation of the lattice constant for these materials were attempted but failed due to the emergence of local minima and the calculations of magnetic properties were instead done using lattice parameters interpolated between known experimental values.
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45

Louch, Sharon. "Magnetism of Fe and Co nanostructured materials." Thesis, University of Leicester, 2005. http://hdl.handle.net/2381/30688.

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The main purpose of this work was to produce a material with a saturation magnetisation greater than 2.45 T, the highest known value, which occurs in the alloy Fe65Co35.;In situ XMCD measurements carried out on size selected Fe nanoclusters deposited onto HOPG substrates revealed an enhancement of the orbital and spin moments above the bulk values for these systems. The measurements also show that there is a further increase in the moments when the Fe clusters are coated with Co. These experiments took place on beamline ID12B at the ESRF in Grenoble.;Following on from the XMCD results, samples
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46

Aronova, Maria A. "Combinatorial investigation of magnetic materials." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1962.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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47

Tegusi. "Novel materials for magnetic refrigeration." Amsterdam : Amsterdam : [s.n.] ; Universiteit van Amsterdam [Host], 2003. http://dare.uva.nl/document/69615.

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48

Allan, Margaret Lucy. "Magnetic interactions in molecular materials." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387026.

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49

Staniland, Sarah S. "Sulphur-rich molecular magnetic materials." Thesis, University of Edinburgh, 2005. http://hdl.handle.net/1842/12990.

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The work within this thesis is concerned with several different magnetic systems all involving materials that are rich in sulphur and are thus predicted to have strong magnetic coupling through these sulphur atoms. Firstly, a range of molecular salt materials of [dithiazolyl]<sub>x</sub>[M(dithiolene)<sub>2</sub>] were synthesised and their magnetic behaviour analysed. Dithiolene complex salts of [BDTA]<sup>+</sup> [2]-[6] were found to have a mainly mixed anion-cation stacked structural motif and show a number of interesting magnetic properties, such as an almost perfect one dimensional antif
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50

Clavel, Guylhaine. "Magnetic impurities in nanostructured materials." Doctoral thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/3210.

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Doutoramento em Química<br>Os resultados apresentados aqui foram alcançados no âmbito do programa de doutoramento intitulado “Impurezas Magnéticas em Materiais Nanoestruturados”. O objectivo do estudo foi a síntese e caracterização de óxido contendo impurezas magnéticas. Durante este trabalho, sínteses de sol-gel não-aquoso têm sido desenvolvidos para a síntese de óxidos dopados com metais de transição (ZnO e ZrO2). A dopagem uniforme é particularmente importante no estudo de semicondutores magnéticos diluídos (DMSs) e o ponto principal deste estudo foi verificar o estado de oxidação e a est
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