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Dissertations / Theses on the topic 'Antiferromagnetic'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Sinclair, John. "Novel antiferromagnetic materials." Thesis, University of York, 2018. http://etheses.whiterose.ac.uk/21962/.

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There is intense interest in new antiferromagnetic materials due to the development of antiferromagnetic spintronics. Currently, the material IrMn is used, however, Iridium is one of the scarcest and most expensive elements. In this work, a number of novel, thin film antiferromagnetic materials were produced using sputter deposition and then assessed using magnetic and structural characterisation techniques as well as a temperature dependent resistivity technique developed during the project.

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2

Ulloa, Osorio Camilo Edgardo. "Aspects of antiferromagnetic spintronics." Tesis, Universidad de Chile, 2016. http://repositorio.uchile.cl/handle/2250/140609.

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Magíster en Ciencias, Mención Física<br>La spintrónica se perfila como una de las corrientes mas atractivas y prometedoras dentro de la materia condensada gracias a la diversidad de fenómenos presentes, como el efecto Hall de spin, la magneto-resistencia gigante. En la spintrónica el estudio de materiales antiferromagnéticos es interesante pues dentro de sus propiedades se encuentran su abundancia natural y la posibilidad de disminuir las escalas temporal y espacial de los fenómenos presentes en ellos. Un ejemplo es la utilización de estos materiales en memorias magnéticas, pues gracias a la a

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3

Yu, Sisheng. "Spin Dynamics in Antiferromagnetic Heterostructures." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1586599000240225.

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4

Trzeciecki, Mikołaj. "Second harmonic generation from antiferromagnetic interfaces." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=96147792X.

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5

Sort, Viñas Jordi. "Magnetic hardening induced by ferromagnetic-antiferromagnetic coupling." Doctoral thesis, Universitat Autònoma de Barcelona, 2002. http://hdl.handle.net/10803/3340.

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Es bien sabido que las interacciones de canje inducidas entre materiales ferromagnéticos (FM) y antiferromagnéticos (AFM) cuando son enfriados desde una temperatura superior a la temperatura de Néel, TN, del AFM, hacen aumentar la coercividad, HC, del componente FM. Nosotros hemos analizado los efectos de hacer una molienda mecánica de polvos FM (Co o SmCo5) con AFM (con TN, ya sea por encima de temperatura ambiente, por ejemplo el NiO, o por debajo, por ejemplo el CoO). Se han estudiado varias combinaciones (Co + NiO, SmCo5 + NiO y SmCo5 + CoO), dando especial énfasis a los sistemas FM + NiO.

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6

Tajiri, Shinya, and Jun-ichiro Inoue. "Ferromagnetic-antiferromagnetic transition in (La-R)_4Ba_2Cu_2O_10." The American Physical Society, 2006. http://hdl.handle.net/2237/7135.

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7

Baker, Michael Lloyd. "Antiferromagnetic wheels probed by inelastic neutron scattering." Thesis, University of Manchester, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.542789.

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8

Szàllàs, Attila. "Heisenberg antiferromagnetic model on 2D quasiperiodic tilings." Paris 11, 2008. http://www.theses.fr/2008PA112174.

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Le pavage de Penrose est une structure quasipériodique bidimensionnelle, utilisée dans la description des composés quasicristallins. Cette structure est parfaitement ordonnée, avec une symétrie de rotation cinq et elle est invariante sous un changement d'échelle par un facteur τ. Nous avons étudié les propriétés d'un modèle d'Heisenberg sur le pavage de Penrose construit à partir de losanges, en utilisant une méthode de développement en ondes de spin. Les énergies et fonctions d'ondes des magnons (quantum d'une onde des spins) ont été étudiées dans le cadre d'une théorie linéarisée. Les propri

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9

Chirac, Théophile. "New spintronic components based on antiferromagnetic materials." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS482.

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Les mémoires magnétiques actuelles commencent à atteindre leurs limites physiques en terme de stabilité, vitesse et consommation énergétique, alors que la course à la miniaturisation s'intensifie. Le champ émergeant de la spintronique étudie le comportement collectif des spins dans la matière ainsi que leurs interactions aux interfaces, afin de trouver une solution en termes de matériaux, architectures et sources excitatrices. En particulier, les matériaux antiferromagnétiques sont particulièrement prometteurs. Ces matériaux ordonnées sont abondants, naturellement stables, robustes, ultra rapi

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10

Bergmann, Andre. "Antiferromagnetic dipolar ordering in [Co2MnGe/V]N multilayers." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980629276.

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11

Bruno, Juan Diderot 1970. "Quantum mechanical studies of Heisenberg antiferromagnetic spin chains." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/84735.

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12

Chen, James J. (James Jie). "Magnetic properties of Heisenberg antiferromagnetic EuTe/PbTe superlattices." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38385.

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13

Akmaldinov, Kamil. "Ferromagnetic/antiferromagnetic exchange bias nanostructures for ultimate spintronic devices." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENY009/document.

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Les applications d’électronique de spin telles les mémoires à accès aléatoire (MRAM), les capteurs (e.g.les têtes de lecture des disques durs d’ordinateurs) et les éléments de logique magnétique utilisent les interactionsd’échange ferromagnétique/antiferromagnétique (F/AF) dans le but de définir une direction de référence pour lespin des électrons de conduction. Les MRAM à écriture assistée thermiquement (TA-MRAM) utilisent mêmedeux bicouches F/AF : une pour le stockage de l’information et l’autre comme référence. Ces dernièresapplications technologiques impliquent des étapes de nanofabricatio

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14

Bayri, Ali. "Antiferromagnetic phase transitions in γ Mn alloys by alloying". Thesis, University of Bath, 1993. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760643.

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15

Haykal, Angela. "Exploring the antiferromagnetic order with a single-spin magnetometer." Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTS057.

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Les matériaux antiferromagnétiques (AF) suscitent actuellement un intérêt considérable pour la conception de futurs dispositifs spintroniques à faible coût énergétique et ultra-rapides. Cependant, l’exploration de ces matériaux novateurs se heurte à des défis d’imagerie magnétique : la plupart des techniques conventionnelles de microscopie magnétique en espace réel ne peuvent pas sonder l'ordre AF aux échelles nanométriques, en raison de la compensation des moments magnétiques donnant lieu à des signaux magnétiques extrêmement faibles. Il s'agit d'un obstacle majeur à la compréhension fondamen

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16

Frapolli, Camille. "Thermodynamics and magnetism of antiferromagnetic spinor Bose-Einstein condensates." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEE006/document.

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Dans ce manuscrit, nous présentons une étude expérimentale d'un gaz de Bose de spin 1 avec des interactions antiferromagnétiques avec des atomes de sodium ultra-froids dans l'état hyperfin F=1. Les trois composantes Zeeman sont piégées simultanément dans des pièges dipolaires optiques. Nous obtenons un condensat de Bose-Einstein spineur par refroidissement évaporatif et nous étudions ses propriétés magnétiques. Il y a deux types d’interactions dans le système: des interactions de contact qui ne changent pas les populations des composantes Zeeman et des interactions d'échange de spin qui les mo

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17

France, Derek Edward. "The mineral magnetic characterisation of goethite and haematite in soils and sediments." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263900.

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18

Sugimoto, Koudai. "Theoretical Study of Electron Dynamics in Multi-Orbital Antiferromagnetic Metals." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199089.

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19

Waby, Neil Anthony. "Nonlinear magnetostatic spin wave pulses in ferromagnetic and antiferromagnetic films." Thesis, University of Salford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308262.

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20

Lin, Weiwei, Kai Chen, Shufeng Zhang, and C. L. Chien. "Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator." AMER PHYSICAL SOC, 2016. http://hdl.handle.net/10150/614754.

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We report a large enhancement of thermally injected spin current in normal metal (NM)/antiferromagnet (AF)/yttrium iron garnet (YIG), where a thin AF insulating layer of NiO or CoO can enhance the spin current from YIG to a NM by up to a factor of 10. The spin current enhancement in NM/AF/YIG, with a pronounced maximum near the Neel temperature of the thin AF layer, has been found to scale linearly with the spin-mixing conductance at the NM/YIG interface for NM = 3d, 4d, and 5d metals. Calculations of spin current enhancement and spin mixing conductance are qualitatively consistent with the ex

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21

Hills, Victoria Anne. "MBE growth, characterisation and physics of antiferromagnetic copper manganese arsenide." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/38467/.

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Research into antiferromagnetic materials for application in spintronics has rapidly expanded in recent years. The prediction and observation of spin based phenomena with antiferromagnets as the active components, has expanded the field and there is a need for high quality materials that are compatible with existing III-V semiconductor systems to expand this research. Copper manganese arsenide is one such material and will be the subject of this thesis. Early studies had shown that this material grows epitaxially on both gallium arsenide and gallium phosphide substrates by molecular beam epita

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22

Corre, Vincent. "Magnetism in spin-1 Bose-Einstein condensates with antiferromagnetic interactions." Thesis, Paris, Ecole normale supérieure, 2014. http://www.theses.fr/2014ENSU0020/document.

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Dans cette thèse nous étudions expérimentalement les propriétés magnétiques de condensats de sodium de spin 1 à l'équilibre. Dans ce système les atomes peuvent occuper chacun des trois états Zeeman caractérisés par la projection de leur spin sur l'axe de quantification m=+1,0,-1. Nous mesurons l'état de spin à N particules du système en fonction du champ magnétique appliqué et et de la magnétisation (différence entre les populations des états m=+1 et m=-1) du nuage atomique. Nos mesures sont en très bon accord avec la prédiction de la théorie de champ moyen, et nous identifions deux phases mag

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23

Deni, Mohd Salleh Mohd. "Vibrational anharmonicity and the elastic behaviour of some antiferromagnetic materials." Thesis, University of Bath, 1988. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380942.

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24

Petersen, andreas. "Magnetization Dynamics and Anisotropy in Ferromagnetic/Antiferromagnetic Ni/NiO Bilayers." W&M ScholarWorks, 2007. https://scholarworks.wm.edu/etd/1539626855.

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25

An, Ran. "Study of the field-induced phase transition for the antiferromagnetic chain /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MATH%202006%20AN.

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26

Nakamura, A., T. Ito, H. Ohnishi, A. Koizumi, and Y. Takeda. "Magnetotransport and Antiferromagnetic Behavior in ErP Epitaxial Layers on GaInP(001)." American Institite of Physics, 2007. http://hdl.handle.net/2237/12036.

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27

Ferri, Silvia. "Analysis of the spectrum of the spin-1 biquadratic antiferromagnetic chain." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8323/.

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In questo elaborato vengono discusse le catene di spin-1, modelli quantistici definiti su un reticolo unidimensionale con interazione tra siti primi vicini. Fra la ricca varietà di tipologie esistenti è stato scelto di porre attenzione primariamente sul modello antiferromagnetico con interazione puramente biquadratica. Vengono presentati diversi metodi di classificazione degli autostati di tale modello, a partire dalle simmetrie che ne caratterizzano l’Hamiltoniana. La corrispondenza con altri modelli noti, quali il modello XXZ di spin 1/2, la catena di Heisenberg SU (3) ed i modelli di Potts,

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28

Barker, Joseph. "Atomistic models of magnetic systems with combined ferromagnetic and antiferromagnetic order." Thesis, University of York, 2013. http://etheses.whiterose.ac.uk/4867/.

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There has long been an interest in the exploitation of novel magnetic behaviour for practical applications such as magnetic storage devices. Some of the most interesting dynamical behaviour occurs when a material contains both ferromagnetic (FM) and antiferromagnetic (AF) characteristics. Many such systems have forgone study due to practical difficulties of experimental observation of antiferromagnetic order. In this work several systems of current interest which contain both AF and FM order are studied. These materials and systems are used, or are candidates for, technological applications, e

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29

Chelaru, Liviu Ionut. "Microscopic studies of interlayer magnetic coupling across nonmagnetic and antiferromagnetic spacer layers." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=970939299.

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30

Sapozhnik, Alexey [Verfasser]. "Magnetic properties of antiferromagnetic Mn2Au: exchange interaction and domain manipulation / Alexey Sapozhnik." Mainz : Universitätsbibliothek Mainz, 2018. http://d-nb.info/1170263666/34.

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31

Arani, S. A., and M. Salavati-Niasari. "Chemical Synthesis of Sub-micrometer- to Nanometer-sized of Antiferromagnetic Sr2CuO3 Ceramic." Thesis, Сумський державний університет, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34767.

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In summery, we describe the synthesis of the Sr2CuO3 particles from micro- to nano-meter by the modified sol–gel technique. It was demonstrated by SEM images that in samples prepared with low molar ratio of citric acid, nano -structure materials with small and tiny grains were obtained. The XRD result showed that the single phase of Sr2CuO3 sample without any impurity peak is formed at 950 degrees Celsius. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34767

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32

Palmer, Stephanie E. "Order and disorder in two geometrically frustrated antiferromagnets." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342663.

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33

Fledderjohann, Andreas. "Ground state properties of antiferromagnetic spin-1/2 Heisenberg systems in external fields." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=964224852.

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34

Offi, Francesco. "Magnetic interaction between antiferromagnetic and ferromagnetic films Co/Fe50Mn50 bilayers on Cu(001) /." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965233448.

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35

Pankhurst, Q. A. "A Mossbauer study of the spin-flop phase transition in some antiferromagnetic materials." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372727.

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The spin-flop phase transition has long been of interest to both theoretical and experimental physicists, ever since it was first predicted by Louis Neel in 1936. In this work spin-flop transitions in the antiferromagnetic materials K 2 FeF 5 , Rb 2 FeF 5 and a-Fe 2 0 3 have been 57 studied by means of Fe MBssbauer spectroscopy. Spectra of K2FeF5 and Rb2FeF5 single crystals were recorded at 4.2K with external magnetic fields of up to 14T applied in different modes, providing information on the effect of misalignment on the sharpness or 'order' of the observed transition. Directing the applied

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36

Ross, Andrew [Verfasser]. "Probing magnetostatic and magnetotransport properties of the antiferromagnetic iron oxide hematite / Andrew Ross." Mainz : Universitätsbibliothek der Johannes Gutenberg-Universität Mainz, 2021. http://d-nb.info/1230059962/34.

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37

Fischer, Johanna. "Imaging and tailoring electric and antiferromagnetic textures in multiferroic thin films of BiFeO₃." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASP013.

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Les matériaux antiferromagnétiques suscitent un intérêt croissant pour la spintronique de par leur insensibilité aux champs magnétiques parasites et leur dynamique magnétique ultrarapide. Cependant, la lecture et le contrôle de l’ordre antiferromagnétique restent des verrous pour le développement des dispositifs. Dans les matériaux multiferroïques, le couplage magnétoélectrique entre les ordres électrique et magnétique pourrait permettre de contrôler l’antiferromagnétisme avec un champ électrique. Dans cette thèse, nous imageons une grande variété de textures antiferromagnétiques que nous cont

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38

Zhang, Pengxiang. "Quantitative study on current-induced effects in an antiferromagnetic insulator/Pt bilayer film." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127283.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, May, 2020<br>Cataloged from the official PDF of thesis.<br>Includes bibliographical references (pages 72-76).<br>Electrical control and detection of magnetic ordering inside antiferromagnets have attracted considerable interests, for making next generation of magnetic random access memory with advantages in speed and density. However, a full understanding of the recent prototypical spinorbit torque antiferromagnetic memory devices requires more quantitative and systematic study. In t

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39

Trabant, Christoph. "Ultrafast photoinduced phase transitions in complex materials probed by time-resolved resonant soft x-ray diffraction." Phd thesis, Universität Potsdam, 2014. http://opus.kobv.de/ubp/volltexte/2014/7137/.

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In processing and data storage mainly ferromagnetic (FM) materials are being used. Approaching physical limits, new concepts have to be found for faster, smaller switches, for higher data densities and more energy efficiency. Some of the discussed new concepts involve the material classes of correlated oxides and materials with antiferromagnetic coupling. Their applicability depends critically on their switching behavior, i.e., how fast and how energy efficient material properties can be manipulated. This thesis presents investigations of ultrafast non-equilibrium phase transitions on such new

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40

Duong. "Correlation between magnetic interactions and magnetic structures in some antiferromagnetic rare earth intermetallic compounds." Amsterdam : Amsterdam : [s.n.] ; Universiteit van Amsterdam [Host], 2002. http://dare.uva.nl/document/62035.

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41

Balluff, Jan [Verfasser], Günter [Akademischer Betreuer] Reiss, and Thomas [Akademischer Betreuer] Dahm. "Ab initio to application: antiferromagnetic Heusler compounds for spintronics / Jan Balluff ; Günter Reiss, Thomas Dahm." Bielefeld : Universitätsbibliothek Bielefeld, 2017. http://d-nb.info/114058605X/34.

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42

Ling, Meng-Chieh [Verfasser], and J. [Akademischer Betreuer] Schmalian. "Impurity Controlled Antiferromagnetic Quantum Criticality in Heavy Fermion Systems / Meng-Chieh Ling ; Betreuer: J. Schmalian." Karlsruhe : KIT-Bibliothek, 2016. http://d-nb.info/1122461569/34.

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43

Ohldag, Hendrik. "Exchange coupling of Co and Fe on antiferromagnetic NiO investigated by dichroism X-Ray absorption spectromicroscopy." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=969129815.

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44

Banks, Michael George. "Investigation of frustrated one-dimensional antiferromagnetic quantum chain systems and the rare earth intermetallic compound TmGa3." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/36017.

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My thesis concerns two areas of current research in magnetism, with the common experimental technique of elastic and inelastic neutron scattering on powders and single crystals. The first topic is concerned with rare earth intermetallic compounds with unfilled 4f shells. When a rare earth element with an unfilled shell is placed in an environment with surrounding charges, the crystal electric field acts to lift the J-fold degeneracy. Determination of the Crystal Electric Field (CEF) ground state and excited states are important to understand the complex and interesting low temperature phase di

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45

Cheruiyot, Linnus L. Carleton University Dissertation Chemistry. "Long range antiferromagnetic exchange coupling in dinuclear copper(II) complexes containing 1.4-dicyanamidobenzene dianion bridging ligands." Ottawa, 1994.

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46

Cheng, Ran. "Aspects of antiferromagnetic spintronics." Thesis, 2014. http://hdl.handle.net/2152/25928.

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Spintronics is the study of mutual dependence of magnetization and electron transport, which forms a complementary picture in ferromagnetic (FM) materials. Recently, spintronics based on antiferromagnetic (AF) materials has been suggested. However, a systematic study is not yet available, and a complementary picture of the AF dynamics with electron transport is highly desired. By developing a microscopic theory, we predict the occurrence of spintronic phenomena both in bulk AF texture and on the interface of AF with normal metals. For the bulk, we find that the electron dynamics becomes adiaba

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47

Tseng, Tien-Wei, and 曾天蔚. "Antiferromagnetic spin wave in Ce2CuGe6." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/34949033743697447823.

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48

Chou, Chih-Shiang, and 周自翔. "Tunneling Magnetoresistance on Synthetic Antiferromagnetic Layers." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/98094813211630950290.

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碩士<br>國立臺灣大學<br>物理學研究所<br>91<br>Tunneling magnetoresistance (TMR) is due to the different tunneling rate of electrons with different spin between magnetic multilayer. In this thesis, we attach synthetic antiferromagnetic (SAF) layer to the pseudo-spin valve (PSV) magnetic tunneling junction (MTJ) to study the magnetic properties, electric properties, and interaction in between. Samples are fabricated by a ultra-high-vacuum sputtering at the base pressure below 9×10^{-8} torr. The structure of our SAF MTJs is glass substrate/buffer-layer/CoFe/Ru/CoFe/Al2O3/CoFe/NiFe, in which CoFe/Ru

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49

Liu, Huang-Sheng, and 劉皇昇. "Magnetostriction of the antiferromagnetic Ir20Mn80 thin films." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/66694646171143511398.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>96<br>In this study, we have made Ir20Mn80 antiferromagnetic thin films on a Corning 0211 glass substrate, respectively, by sputtering method. Sample configuration is glass (110 �慆)/Ir20Mn80 (X Å)/Ta (100 Å), When X=1500 Å, 1000 Å, 500 Å, 300 Å and 100 Å. To anneal the sample, we had the annealing temperature 250 ℃, annealing time 1 hour. There were two sets of samples: one is annealing, the other is without. We analyzed the magnetic property by vibrating sample magnetometer (VSM). The crystalline structure and the phase were analyzed by XRD. Young’s modulus of thin

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Akosa, Collins Ashu. "Spin Transport in Ferromagnetic and Antiferromagnetic Textures." Diss., 2016. http://hdl.handle.net/10754/621988.

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In this dissertation, we provide an accurate description of spin transport in magnetic textures and in particular, we investigate in detail, the nature of spin torque and magnetic damping in such systems. Indeed, as will be further discussed in this thesis, the current-driven velocity of magnetic textures is related to the ratio between the so-called non-adiabatic torque and magnetic damping. Uncovering the physics underlying these phenomena can lead to the optimal design of magnetic systems with improved efficiency. We identified three interesting classes of systems which have attracted enorm

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