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Dissertations / Theses on the topic 'Multiferroic Materials'

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Published: 4 June 2021
Last updated: 7 September 2023

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1

Figueiras, Fábio Gabriel Nazário. "Study of multiferroic materials." Doctoral thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/4271.

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Doutoramento em Física<br>The present PhD work aims the research and development of materials that exhibit multiferroic properties, in particular having a significant interaction between ferromagnetism and ferroelectricity; either directly within an intrinsic single phase or by combining extrinsic materials, achieving the coupling of properties through mechanic phenomena of the respective magnetostriction and piezoelectricity. These hybrid properties will allow the cross modification of magnetic and electric polarization states by the application of cross external magnetic and/or electric fie
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2

Valdes, Aguilar Rolando. "Electromagnons in multiferroic materials." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8851.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.<br>Thesis research directed by: Dept. of 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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3

Dixit, Anant. "Relativistic effects : applications to multiferroic materials." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAE037/document.

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Notre étude porte sur des matériaux à effets relativistes importants. L'hamiltonien semi-relativiste, couplé aux équations de Maxwell (EM), permet de déduire les sources de courant et de densité, incluant des termes de second ordre (polarisations de spin et de Darwin). Différents modèles sont développés par expansion des EM. L'étude ab initio montre que (1) le désordre atomique peut produire le ferrimagnétisme (FM) dans GaFeO3 (GFO) multiferroïque, (2) les états 3d Fe des octaèdres déformés ont une levée de dégénérescence tétraédrique (théorie du champ cristallin), (3) la polarisation électriq
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4

Yang, Mingmin. "Photoelectric processes in ferroelectric/multiferroic materials." Thesis, University of Warwick, 2018. http://wrap.warwick.ac.uk/105580/.

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Photoferroelectrics, which is defined as the interaction of ferroelectric materials with light, has attracted renewed attention recently and emerged as a topic of both fundamental interest and technological importance. It not only provides potential applications in sensors and photovoltaic devices but also offers a fertile playground to gain insight into the physics of ferroelectricity. As a prominent example, the bulk photovoltaic effect manifested in the ferroelectric materials under illumination gives rise to an anomalous open-circuit photovoltage exceeding the bandgap as well as a light po
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Lawrence, Shane Michael. "X-ray and neutron scattering of multiferroic LuFe2O4." Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/1336.

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Multiferroic materials have recently begun to attract significant scientific interest due to their potential applications in the design of modern electronic devices. Currently, the magnetic properties of materials form the basis of our electronic data storage and have the potential to enhance the logic operations performed in electronic devices (such as computers and sensors). Non-volatile magnetic memory is used in data storage devices, such as the hard drives found in personal computers, where data is encoded via the magnetisation state of magnetic domains in the device with one of two state
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6

Coy, Emerson. "Growth and characterization of new multiferroic materials." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/395177.

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Multiferroic materials, in which two or more ferroic ordering take place in the same phase, have driven major interest in the last few years, not only due to the possibility of exploring novel physical properties in those materials, but also the implications that such properties show in novel technological applications. From those materials, the especially interesting are those in which the ferromagnetic (FM) and ferroelectric (FE) ordering take place, due to their direct application in magnetodielectric devices. In the field of multiferroic materials such materials could play an important rol
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Hughes, Helen. "Synthesis and characterisation of potential multiferroic materials." Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479084.

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8

Onbaş̧lı, Mehmet Cengiz. "Magneto-optical and multiferroic oxide thin films, integrated nonreciprocal photonic devices and multiferroic memory devices." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98579.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2015.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references.<br>Complex oxide thin films offer unique functionalities which can potentially extend the utility of current storage, processing and optical isolator technologies. In this thesis, we present three categories of studies on complex oxide growt
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9

Aimon, Nicolas M. "Templated self-assembly of multiferroic nanocomposites." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/89948.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 133-150).<br>To respond to the growing demand for smart and connected devices, such as smartphones, tablet PCs arid other mobile hardware, while meeting the needs for increased power efficiency, miniaturization and reduced manufacturing costs, new material solutions need to be considered. These should address the shortcomings of incumbent semiconductor-based technologies which provide a limited numbe
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10

González, Vázquez Otto E. "First-principles investigation of BiFeO3 and related multiferroic materials." Doctoral thesis, Universitat Autònoma de Barcelona, 2012. http://hdl.handle.net/10803/96248.

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Esta tesis trata sobre los magnetoel ectricos multiferroicos, una clase relativamente nueva de materiales descubiertos a mediados del siglo pasado, que presentan simultaneamente ferroelectricidad y magnetismo. El BiFeO3 (BFO) es un oxido con estructura perovskita, el cual es uno de los pocos materiales multiferroicos a temperatura ambiente. Sin embargo, como sus temperaturas de ordenamiento ferroel ectrico y anti-ferromagn etico son relativamente altas (alrededor de 1100 K y 640 K, respectivamente), las respuestas electromec anica y magnetoel ectrica del BFO son relativamente peque~nas
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11

Hearmon, Alexander J. "Neutron, X-ray, and optical studies of multiferroic materials." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:ed15b8aa-4f71-4ed8-bfc5-aec651d9f48d.

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Developing a greater understanding of multiferroic materials, particularly those in which a strong coupling is exhibited between magnetic and electrical orderings, is of great importance if potential applications are to be realised. This thesis reports new experimental findings on several multiferroics using the techniques of X-ray and neutron diffraction together with nonlinear optical experiments. Spherical neutron polarimetry measurements on RbFe(MoO<sub<4</sub>)<sub>2</sub> show how this system's chiral magnetic structure can be controlled by an external electric field. Consideration is gi
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12

Liu, Jiaji. "Lattice, magnetic excitations and their coupling in multiferroic materials." Paris 7, 2013. http://www.theses.fr/2013PA077078.

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Les multiferroïques présentent la rare propriété de posséder simultanément un ordre magnétique et un ordre ferroélectrique qui interagissent via le couplage magnétoélectrique. Les caractéristiques des multiferroïques font ressortir de nouveaux phénomènes physiques et offrent des possibilités de nouvelles fonctions de l'appareil. BiFeO3 et RMnO3 hexagonaux sont deux multiferroïques selon la plupart des enquêtes. Dans ce travail, nous avons étudié les excitations de spin et réseau dans les RMnO3 hexagonaux (R = Yb, Y, Ho) et BiFeO3 films sur des substrats différents. Nos mesures de RMnO3 hexagon
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13

Chen, Haitao, and 陈海涛. "On strain-mediated magnetoelectric effects in multiferroic composite nanostructures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B50899934.

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Multiferroics which combine two or more order parameters of ferroelectricity, ferromagnetism and ferroelasticity, have drawn great interests in the past few years due to their promising potential of application in sensors, transducers, spintronics and multistate memories. Coupling between the ferroelectricity and ferromagnetism renders the induction of an electric polarization P upon applying a magnetic field, or the induction of a magnetization M upon applying an electric field which is called magnetoelectric coupling effect. There are single phase multiferroics which simultaneously possess
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14

Gupta, Rekha. "Magnetoelectric coupling in multiferroic bismuth ferrite based composite nanostructures." Thesis, IIT Delhi, 2017. http://localhost:8080/iit/handle/2074/7057.

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15

Wang, Ruifeng. "Three-Dimensional Finite Element Modeling of Multilayered Multiferroic Composites." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1311365854.

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16

Plaisance, Brandon P. "First principles approach to identification of potential ferroelectric and multiferroic molecular materials." Thesis, Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55039.

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Flexible electronics have garnered much interest over the past several decades. Hybrid organic-inorganic materials, such as metal-organic frameworks, offer a unique opportunity to encompass the effective electronic properties of the inorganic material and the flexible nature of the organic with the potential of enhancing other desirable properties, such as the contributing multiferroicity. Using a first principles approach, the goal of this thesis is to serve as a guide for identifying potential ferroelectric and multiferroic metal-organic frameworks. This is done through a screening method of
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17

Aristizabal, Carlos. "Study of multiferroic materials by means of muon spin rotation and other complementary techniques." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/7853.

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Magnetic and ferroelectric materials have both had a very important impact in our society, not only because of the fascinating science behind the two phenomena, but also as a result of their use in many technological applications. The coupling and coexistence of these two order parameters within the same material opens the door to exiting new functional devices. Materials where magnetism and ferroelectricity coexist are known as multiferroic materials. In this thesis, muon spectroscopy and other complementary experimental techniques, including neutron scattering and resonant ultrasound spectro
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18

Jeddy, Shehnaz. "Thermal stability of defects in strontium titante [i.e., titanate] susbtrates for multiferroic materials." Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2008m/jeddy.pdf.

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19

Liu, Hongbo. "Investigation of new multiferroic materials with coexistence of several ferroic and structural instabilities." Phd thesis, Ecole Centrale Paris, 2011. http://tel.archives-ouvertes.fr/tel-00711475.

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Multiferroics are currently intensely investigated because the coexistence and coupling of ferroic arrangements brings about new physical effects and, for the few room-temperature examples, interesting prospects for applications in various fields. This interest is illustrated by the recent publication of several articles on multiferroics in high impact reviews over the last five years. The main goal of the thesis was to look for new multiferroics by exploiting overlooked and original polar and magnetic arrangements. We more precisely investigated compounds based on lead iron tungsten PbFe2/3W1
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20

Shang, Jing. "2D Magnetic and multiferroic materials: Fundamental physics and application exploration from theoretical simulation." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/227367/1/Jing_Shang_Thesis.pdf.

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This thesis aims to propose the feasible approaches to control and manipulate the magnetism in two-dimensional (2D) magnets through magnetoelectric coupling by using density functional theory (DFT) calculations. It is found that the goal can be achieved by building 2D magnetic-ferroelectric heterostructures or seeking for the multiferroic candidates. The effective manipulations of magnetic states are expected to not only provide new insights into the fundamental research, but also pave the solid foundations for the spintronic applications.
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21

Zhang, Lei. "Computational exploration of low-dimensional materials with novel electronic and ferroic/multiferroic properties." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/232641/1/Lei_Zhang_Thesis.pdf.

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Low-dimensional materials with novel electronic and ferroic properties play a crucial role in the development of next-generation nanoscale functional devices and have drawn extensive research attentions. By using state-of-art first-principles calculations, Monte Carlo simulations, and structural revolution algorithms, four new low-dimensional materials were predicted showing promising applications in electronics or spintronics and two strategies were proposed to introduce ferroelectricity and realize strong electromagnetic coupling in experimentally fabricated low-dimensional materials, which
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22

Hudl, Matthias. "Magnetic materials with tunable thermal, electrical, and dynamic properties : An experimental study of magnetocaloric, multiferroic, and spin-glass materials." Doctoral thesis, Uppsala universitet, Fasta tillståndets fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-168986.

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This thesis concerns and combines the results of experimental studies of magnetocaloric, multiferroic and spin-glass materials, using SQUID magnetometry as the main characteriza-tion technique.  The magnetocaloric effect offers an interesting new technology for cooling and heating applications. The studies of magnetocaloric materials in this thesis are focused on experimen-tal characterization of fundamental magnetic properties of Fe2P-based materials. These are promising magnetocaloric materials with potential industrial use. It is found that the magneto-caloric properties of Fe2P can be opti
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Perks, Natasha J. "The role of charge and orbital ordering in quadruple perovskite materials with multiferroic potential." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:c9287592-bcf4-40e0-ba2b-88f87e3b7450.

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With the overriding goal of developing functional multiferroic systems with technological potential, this thesis focuses on the role of orbital and charge ordering in coupling magnetism and ferroelectricity in synthetic quadruple perovskites. Using x-ray diffraction as the primary characterisation tool, modulations to crystal ordering have been interpreted in terms of orbital occupation and charge variation. Expanding on previous magnetic structure studies and polarisation measurements, structural analysis of CaMn<sub>7</sub>O<sub>12</sub> has led to the experimental realisation of a new mecha
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RICCI, FRANCESCO. "Ab initio investigation of layered and low-symmetry oxides and interfaces: multiferroic junctions, TCO’s, and a ferroelectric metal." Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266795.

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This essay is intended to be a review of the entire resear h work developed during my PhD s hool, highly based on published papers and enri hed by ba kground introdu tions of the debated topi s. My resear h fo used on several distin t topi s sharing the use of ab-initio density fun tional theory al ulations for studying di erent types of materials aimed to te h- nologi al appli ations. First, it deals with the study of the tunneling magneto-resistan e and interfa e magneto- ele tri e e ts of the SrRuO3/PbTiO3/SrRuO3 multi-ferroi tunnel jun tion (MFTJ) with asymmetri interfa es, by using standa
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Doig, Katie I. "Ultrafast and continuous-wave spectroscopy of multiferroic oxide thin films." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:e44e0a2a-a675-4923-90de-a1bdfa24f184.

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Thin film multiferroic oxides with co-existing ferroelectric and ferromagnetic ordering have attracted much interest in recent years, partly as a result of the enhancements achieved through the adoption of strained thin film geometries. This thesis presents work on two such thin film oxides; lanthanide substituted BiFeO<sub>3</sub> and Fe substituted PbTiO<sub>3</sub>. Coherent magnons and acoustic phonons were impulsively excited and probed in thin films of the room temperature multiferroic Bi<sub>1-x-y</sub>Dy<sub>x</sub>La<sub>y</sub>FeO<sub>3</sub> using femtosecond laser pulses. The elast
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Haneberg, Dag Håkon. "A Finite-Size Study on Samarium-Substituted Bismuth Ferrite : Multiferroic and Lead-Free Piezoelectric Materials." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16311.

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Multiferroic materials combine two or more ferroic orders such as ferroelectricity, ferromagnetism and ferroelasticity. They have a great interest for the development of the next generations of digital electronic memory devices. Bismuth ferrite has shown to posess both ferroelectric and magnetic order at room temperature, which makes it both scientifically and comercially interesting.The negative impact on the environment by using lead in mass-produced units has made development of lead-free piezoelectric materials for use in sensors, actuators and transducers prioritized and samarium substitu
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Mukherjee, Devajyoti. "Growth and Characterization of Epitaxial Thin Films and Multiferroic Heterostructures of Ferromagnetic and Ferroelectric Materials." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3622.

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Multiferroic materials exhibit unique properties such as simultaneous existence of two or more of coupled ferroic order parameters (ferromagnetism, ferroelectricity, ferroelasticity or their anti-ferroic counterparts) in a single material. Recent years have seen a huge research interest in multiferroic materials for their potential application as high density non-volatile memory devices. However, the scarcity of these materials in single phase and the weak coupling of their ferroic components have directed the research towards multiferroic heterostructures. These systems operate by coupling th
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Ibrahim, Fatima. "Theoretical study of electronic structure and magnetism in materials for spintronics." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAE003/document.

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L'avenir de la spintronique repose sur le développement de matériaux ayant des propriétés magnétiques remarquables. L'objectif de cette thèse est de comprendre la physique des deux matériaux fonctionnels proposés pour des applications spintroniques qui utilisent des simulations de la densité fonctionnelle.Nous nous sommes intéressés dans une première partie au ferrite de gallium pour lequel il a été montré que les propriétés dépendaient de la concentration de fer.Les spectres optiques ont été calculés et comparés aux spectres expérimentaux suggérant des niveaux élevés de désordre. Dans la deux
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Bhatnagar, Akash [Verfasser], Dietrich [Akademischer Betreuer] Hesse, Kathrin [Akademischer Betreuer] Dörr, and Andrei [Akademischer Betreuer] Kholkin. "Electronic and photoelectronic processes in multiferroic materials / Akash Bhatnagar. Betreuer: Dietrich Hesse ; Kathrin Dörr ; Andrei Kholkin." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2014. http://d-nb.info/1054636672/34.

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D'Souza, Noel. "APPLICATIONS OF 4-STATE NANOMAGNETIC LOGIC USING MULTIFERROIC NANOMAGNETS POSSESSING BIAXIAL MAGNETOCRYSTALLINE ANISOTROPY AND EXPERIMENTS ON 2-STATE MULTIFERROIC NANOMAGNETIC LOGIC." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3539.

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Nanomagnetic logic, incorporating logic bits in the magnetization orientations of single-domain nanomagnets, has garnered attention as an alternative to transistor-based logic due to its non-volatility and unprecedented energy-efficiency. The energy efficiency of this scheme is determined by the method used to flip the magnetization orientations of the nanomagnets in response to one or more inputs and produce the desired output. Unfortunately, the large dissipative losses that occur when nanomagnets are switched with a magnetic field or spin-transfer-torque inhibit the promised energy-efficien
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Bai, Feiming. "Structure-Property Relationships of Multifeorric Materials: A Nano Perspective." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/28055.

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The integration of sensors, actuators, and control systems is an ongoing process in a wide range of applications covering automotive, medical, military, and consumer electronic markets. Four major families of ceramic and metallic actuators are under development: piezoelectrics, electrostrictors, magnetostrictors, and shape-memory alloys. All of these materials undergo at least two phase transformations with coupled thermodynamic order parameters. These transformations lead to complex domain wall behaviors, which are driven by electric fields (ferroelectrics), magnetic fields (ferromagnetics),
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Vaghefi, Seyedeh Pegah Mirzadeh. "Structural and physical properties studies on multiferroic oxide films and heterostructures." Doctoral thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/18502.

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Doutoramento em Engenharia Física<br>O presente trabalho de doutoramento é um estudo de propriedades físicas e aspectos estruturais de filmes de óxidos e heteroestruturas multiferróicas, englobando técnicas de caracterização do nível macroscópico ao microscópico. O objectivo principal é a compreensão de novas heteroestruturas epitaxiais multifuncionais e as suas interfaces para junções de túnel magnetoelétricas e filtros de spin. Os principais materiais em estudo foram manganitas à base de La dopadas com iões divalentes (ba, Sr), apresentando efeito magnetoelétrico, sendo preparadas em
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Curvello, Marcio Sena. "Síntese e caracterização de óxidos multiferroicos." reponame:Repositório Institucional da UFABC, 2017.

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Orientadora: Profa. Dra. Marcia Tsuyama Escote<br>Tese (doutorado) - Universidade Federal do ABC, Programa de Pós-Graduação em Nanociências e Materiais Avançados, Santo André, 2017.<br>Neste trabalho foram estudados os efeitos da substituição do Bi por um elemento terra-rara (R = Pr, Dy) e da adição de polímeros nas propriedades físicas de compostos de BiFeO3 (BFO) sintetizados pelo método hidrotermal assistido por micro-ondas. Inicialmente, amostras de BFO foram preparadas em diferentes condições de síntese (tempo, temperatura e concentração de KOH) e com este estudo escolheu-se os parâmetros
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Liu, Yang. "Multicaloric effect in ferroic materials." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC041/document.

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Les matériaux caloriques à l'état solide, qui subissent un changement de température adiabatique ou un changement d'entropie isothermal lorsque certains stimuli externes (champ électrique, champ magnétique, contrainte ou pression mécanique) est appliquée ou retirée, sont prometteurs pour la réfrigération à l'état solide, comme alternative aux dispositifs de refroidissement conventionnels inventé il y a cent ans qui utilisent des gaz dangereux. Compte tenu des améliorations des systèmes de réfrigération à compression de vapeur approchant très vite de leur limite d'efficacité théorique, en plus
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Fang, Lei. "Exploring spin in novel materials and systems." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1299611695.

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Neuber, Erik [Verfasser], Lukas M. [Akademischer Betreuer] Eng, Lukas M. [Gutachter] Eng, and István [Gutachter] Kézsmárki. "Scanning Probe Microscopy Investigation of Multiferroic Materials Hosting Skyrmion Lattices / Erik Neuber ; Gutachter: Lukas M. Eng, István Kézsmárki ; Betreuer: Lukas M. Eng." Dresden : Technische Universität Dresden, 2019. http://d-nb.info/1226942512/34.

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Aubert, Alex. "Synthèse, caractérisation et modélisation de matériaux multiferroiques (magnétoélectriques) composites massifs." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLN036/document.

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L'effet magnétoélectrique direct est défini par la modification de la polarisation électrique à partir de l'application d'un champ magnétique. Bien que cet effet existe de manière intrinsèque dans certains matériaux, nous étudions ici l'effet extrinsèque, où l'effet magnétoélectrique résulte d'un couplage intermédiaire entre deux phases distinctes. Dans ce cas, l'idée la plus répandue est de lier mécaniquement (par un collage) un matériau piézoélectrique à un matériau magnétostrictif. Ainsi, en appliquant un champ magnétique, le matériau magnétostrictif se déforme, transmet une contrainte au m
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Li, Zheng. "Multiferrocity in bismuth layer structured materials." Thesis, Queen Mary, University of London, 2016. http://qmro.qmul.ac.uk/xmlui/handle/123456789/23218.

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Multiferroics (MF) have attracted much research attention due to the coexistence of ferroelectric and magnetic ordering as well as magnetoelectric (ME) coupling. At present there are very few room temperature single phase MF except BiFeO3. Multiferroic properties of Aurivillius compound Bi5FeTi3O15 were reported at 80 K. The at 80 K. The at 80 K. The at 80 K. The at 80 K. The magnetization of Bi5FeTi3O15 was significantly improved by substituting parts of Fe cations by Co cations. Bi5FeTi3O15 showed ferromagnetic order above room temperature. The magnetic cations Fe/Co in B-site contribute to
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Magrini, William. "Manipulation optique de vortex d’Abrikosov individuels." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0724/document.

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Ce travail de thèse est principalement axé sur le développement d’une nouvelle méthode de manipulation de vortex d’Abrikosov individuels dans les supraconducteurs de type II. Cette méthode, rapide, efficace et précise, est basée sur l’optique en champ lointain et repose sur l’échauffement local du supraconducteur sous l’action d’un faisceau laser focalisé. Elle apporte une excellente alternative aux techniques existantes de manipulation de vortex, toutes basées sur l’utilisation de sondes locales, et donc intrinsèquement lentes et difficiles à mettre en oeuvre dans un environnement cryogénique
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Silberstein, Hont Markus. "Modeling the Effects of Strain in Multiferroic Manganese Perovskites." Thesis, KTH, Materialfysik, MF, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-169584.

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The effects of strain on the magnetic phases in perovskites are of interest in the highly active research field of multiferroics. A Monte Carlo program is written to investigate the influence of strain on the low– temperature magnetic phase diagram of the manganese perovskites, RMnO3, where R is a cation in the lanthanide series. A Metropolis simulation scheme is implemented together with parallel tempering to perform computations in a two–dimensional geometry using a conventional nearest–neighbor and next–nearest–neighbor Heisenberg Hamiltonian, extended to include spin–lattice couplings and
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41

Lewtas, Heather Joanne. "A muon and neutron study of multiferric materials." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556212.

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In this thesis multiferroic materials are investigated through a number of different experimental techniques, particularly p,+SR, neutron scattering and impedance spec- troscopy. The magnetic and dielectric properties of materials, which form multiferroic states through different mechanisms, are explored. Inelastic neutron scattering studies have been made of LuMn03 and LuFe204. Large reciprocal space maps have been made of LuFe204 and an initial spin wave dispersion found. The exchange parameters have been estimated from the data and are shown to support ab initio calculations. The spin wave
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42

Skiadopoulou, Styliani. "Multiferroic behaviour of bismuth ferrite porous thin films." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/11829.

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Mestrado em Engenharia de Materiais<br>An enormous contribution in the scientific community of material engineering is being made by the exceptionally rapid evolution of the field of multifunctional materials. Multiferroics combine simultaneously at least two of the three ferroic properties: ferroelectricity, ferromagnetism and ferroelasticity. Magnetoelectric multiferroics’ ability of magnetic field manipulation via electric fields or vice versa can be extremely promising for information storage applications, leading to thinner, as well as flexible devices, with significantly high energ
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43

Toulouse, Constance. "Matériaux multiferroïques : structure, ordres et couplages. Une étude par spectroscopie Raman." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS179/document.

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Les matériaux multiferroïques sont des matériaux dans lesquels des ordres magnétiques, électriques et élastiques peuvent coexister dans une même phase. Ces ordres peuvent être couplés entre eux et l’étude de ces couplages permet de mieux comprendre les mécanismes à l’œuvre dans ces matériaux. Cette thèse porte sur l’étude de différents composés multiferroïques par spectroscopie Raman. Dans la ferrite de bismuth (BiFeO₃), l'effet de la contrainte sur le magnétisme, aussi bien sur les films minces (par contrainte épitaxiale) que le bulk (par pression hydrostatique) est étudié en détail. Cette th
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Medeiros, Marco Sílvio Assamo. "Synthesis and characterization of magnetoelectric/multiferroic ceramics." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/11728.

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Mestrado em Engenharia de Materiais<br>Materiais magnetoelétricos e multiferróicos que exibem simultaneamente propriedades ferroelétricas e ferromagnéticas, têm suscitado um crescente interesse na comunidade científica para o desenvolvimento de materiais multifuncionais. Neste trabalho pretendeu-se fabricar materiais cerâmicos multiferroicos e realizar um estudo do acoplamento entre propriedades magnéticas e as propriedades piezoelétricas/ferroelétricas dos compósitos. Assim, foram realizados estudos sobre a síntese das hexaferrites (BaFe12O19, SrFe12O19, Ba3Co2Fe24O41 e Sr3Co2Fe24O41), com d
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45

Gastaldo, Vinícius Pascotto. "Multiferroicity and structural anomalies in quadruple perovskite manganites : case study (A)Mn7O12, A=Na and La." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS324.

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Dans cette thèse on étude les oxydes de manganèse NaMn7O12 et LaMn7O12, qu'appartiennent à la structure de pérovskite quadruple sous les points de vue de la multiferroïcité, du couplage magnétoélectrique, et aussi des anomalies structurelles dynamiques en NaMn7O12. Ces études concernent l'existence, les mécanismes d'établissement de la multiferroïcité et le couplage entre les ordres ferroïques en ces matériaux. Les forces motrices des anomalies structurels dynamiques en NaMn7O12 sont aussi étudiés au sens de clarifier les mécanismes de déformation structurel et quel est son importance ao établ
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46

Hamann, Borrero Jorge Enrique. "X-ray studies of magnetism and electronic order in Fe-based materials." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-64870.

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The structure and magnetism of selected compounds of the pnictides iron based superconductors with chemical formula LnO{1-x}FeAsFx (Ln = La,Sm and Ce), commonly known as 1111, and of rare earth iron borates RFe3(BO3)4 (R = Tb, Gd, Nd and Y), were studied by means of hard x-ray diffraction. For the 1111 pnictides compounds, Rietveld refinement of powder x-ray diffraction measurements at room temperature reveals, that the ionic substitution of O by F has no effect on the structure of the FeAs layers of tetrahedra, whereas the major changes takes place in the LnO layer. These changes are reflect
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Hatling, Oddmund. "Multiferroic, Magnetoelectric Nanoparticles : Lanthanum-substituted Bismuth Ferrite." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16315.

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In this report, 10 at% lanthanum was introduced to the perovskite structure of bismuth ferrite at the expense of bismuth through a modified Pechini wet chemical method. Green body powders were calcined at several temperatures, and the lattice parameters for each size were found by Rietveld refinement of X-ray powder diffraction data. The parameters displayed strong size-dependent properties, and the rhombohedral distortion from the cubic structure was reduced by decreased particle size. With decreasing crystallite size, the N&#233;el temperature decreased and the cooperative cationic displacem
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48

Rotaru, Andrei. "Novel polar dielectrics with the tetragonal tungsten bronze structure." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/4184.

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There is great interest in the development of new polar dielectric ceramics and multiferroic materials with new and improved properties. A family of tetragonal tungsten bronze (TTB) relaxors of composition Ba₆M³⁺Nb₉O₃₀ (M³⁺ = Ga³⁺, Sc³⁺ and In³⁺, and also their solid solutions) were studied in an attempt to understand their dielectric properties to enable design of novel polar TTB materials. A combination of electrical measurements (dielectric and impedance spectroscopy) and powder diffraction (X-ray and neutron) studies as a function of temperature was employed for characterising the dynamic
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Drathen, Christina. "Transition metal fluorides : from superconductors to multiferroics." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/6687.

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Transition metal fluorides represent an important family of complex solids displaying a variety of different properties and interesting phenomena. Despite their remarkable behaviour, these classes of materials have not received much attention and the rationalization of their behaviour is still lacking a systematic approach. This thesis aims to contribute to the field by examining previously unknown or understudied complex fluorides. The compounds were selected for their intriguing physical properties that range from superconductivity to multiferroism. The discovery of superconductivity in the
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Zadeh, Ali Baghi. "Coupling of magnetic, strain and electric polarization fields in the structure of multiferroic material." Doctoral thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/15945.

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Doutoramento em Ciência e Engenharia de Materiais<br>The comprehensive study on the coupling of magnetism, electrical polarization and the crystalline lattice with the off-stoichiometric effects in self-doped multiferroic hexagonal h-LuMnxO3±δ (0.92≤x≤1.12) ceramic oxides was carried out for the PhD work. There is a complex coupling of the three ferroic degrees. The cancelation of the magnetic moments of ions in the antiferromagnetic order, electric polarization with specific vortex/antivortex topology and lattice properties have pushed researchers to find out ways to disclose the underlying p
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