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Dissertations / Theses on the topic 'The multiferroic BiFeO3'

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Published: 1 June 2024
Last updated: 31 July 2025

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1

Waterfield, Price Noah. "Domains and functionality in multiferroic BiFeO3 films." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:e8a8f8ff-8510-4fdf-93f4-0037cebc0210.

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For over half a century, the technological promise of spins manipulable by a small voltage has captivated the interest of experimental and theoretical researchers alike. However, if thin-film multiferroics are to be incorporated into future data storage devices, a much greater understanding of their behaviour and how they differ from their bulk counterparts is required. In this thesis, we probe the fundamental multiferroic properties of BiFeO<sub>3</sub> films through a combination of state-of-the-art diffraction and microscopy techniques. We investigate the coupling between magnetic, ferroele
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2

Masteghin, João Francisco Vieira. "Síntese e propriedades de filmes finos multiferróicos de BiFeO3." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/153560.

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Submitted by João Francisco Vieira Masteghin null (joaomasteghin@gmail.com) on 2018-04-16T21:18:21Z No. of bitstreams: 1 Dissertação Final.pdf: 2348816 bytes, checksum: 9fdfdbe5ee57f69406f5ad67e41a18fc (MD5)<br>Approved for entry into archive by Cristina Alexandra de Godoy null (cristina@adm.feis.unesp.br) on 2018-04-17T13:19:42Z (GMT) No. of bitstreams: 1 masteghin_jfv_me_ilha.pdf: 2348816 bytes, checksum: 9fdfdbe5ee57f69406f5ad67e41a18fc (MD5)<br>Made available in DSpace on 2018-04-17T13:19:42Z (GMT). No. of bitstreams: 1 masteghin_jfv_me_ilha.pdf: 2348816 bytes, checksum: 9fdfdbe5ee57f6
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3

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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4

Blouzon, Camille. "Photoelectric and magnetic properties of multiferroic domain walls in BiFeO3." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066006/document.

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De tous les matériaux multiferroïques, BiFeO3 est celui qui est le plus étudié. C’est un ferroélectrique, antiferromagnétique dont les températures de transition sont bien au-dessus de la température ambiante. De plus, le couplage magnétoélectrique entre ces deux paramètres d’ordre a été observé aussi bien dans les cristaux que dans les couches minces. BiFeO3 possède également la plus grande polarisation ferroélectrique jamais mesurée, 100µC/cm². De gros efforts sont fournis pour comprendre et exploiter les propriétés physiques de ce matériau. Dans ce but, il est important de pouvoir contrôler
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5

Thrall, Michael. "The magnetic, electric and structural properties of multiferroic BiFeo3 and BiMnO3." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492716.

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Bulk BiFe03 samples prepared by the conventional mixed oxide route were investigated. High purity Bi203 and Fe203 powders were weighed according to stoichiometry and milled for 20 hours. The powders were pressed into cylinders (10mm diameter by 6mm thickness) at 100 MPa. The cylinders were heated at a rate of 3 degrees C/min at temperatures of between 700 degrees C and 900°C for times between 7.5 minutes and 48 hours. XRD spectra collected from both the as-sintered and 'bulk' (internal) surfaces showed the formation of additional Bi2Fe40, and Bi25Fe04o secondary phases coexisting alongside th
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6

Wójcik, Katarzyna. "The synthesis, structure and reactivity of iron-bismuth complexes : Potential Molecular Precursors for Multiferroic BiFeO3." Doctoral thesis, Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000715.

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The thesis presented here is focused on the synthesis of iron-bismuth alkoxides and siloxides as precursors for multiferroic BiFeO<sub>3</sub> systems. Spectrum of novel cyclopentadienyl substituted iron-bismuth complexes of the general type [{Cp<sup>y</sup>(CO)<sub>2</sub>Fe}BiX<sub>2</sub>], as potential precursors for cyclopentadienyl iron-bismuth alkoxides or siloxides [{Cp<sup>y</sup>(CO)<sub>2</sub>Fe}Bi(OR)<sub>2</sub>] (R-O<sup>t</sup>Bu, OSiMe<sub>2</sub><sup>t</sup>Bu), were obtained and characterised. The use of wide range of cyclopentadienyl rings in the iron carbonyl compounds all
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7

Lorenz, Michael, Gerald Wagner, Vera Lazenka, et al. "Correlation of magnetoelectric coupling in multiferroic BaTiO3-BiFeO3 superlattices with oxygen vacancies and antiphase octahedral rotations." American Institute of Physics, 2015. https://ul.qucosa.de/id/qucosa%3A31214.

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Multiferroic (BaTiO3-BiFeO3) × 15 multilayer heterostructures show high magnetoelectric (ME) coefficients aME up to αME up to 24 V/cm·Oe at 300 K. This value is much higher than that of a single-phase BiFeO3 reference film (αME = 4.2 V/cm·Oe). We found clear correlation of ME coefficients with increasing oxygen partial pressure during growth. ME coupling is highest for lower density of oxygen vacancy-related defects. Detailed scanning transmission electron microscopy and selected area electron diffraction microstructural investigations at 300K revealed antiphase rotations of the oxygen octahed
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8

Yousfi, Said. "Mécanismes de conduction et effet photovoltaïque dans des films minces de BiFeO3." Electronic Thesis or Diss., Amiens, 2018. http://www.theses.fr/2018AMIE0017.

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Le multiferroїque BiFeO3 est l'un des matériaux ferroïques les plus étudiés à ce jour du fait de la coexistence à température ambiante d'un état ferroélectrique et antiferromagnétique. Il présente de plus une réponse photovoltaïque dont l'origine précise n'est actuellement pas comprise. Le but principal de cette thèse est donc d'étudier les propriétés photovoltaïques de films épitaxiés BiFeO3. Préalablement à l'investigation des propriétés photovoltaïques une étude des mécanismes de conduction a été entreprise. Un transport polaronique de saut via les défauts les plus proches voisins a été mis
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9

Jarrier, Romain. "Influence de la stœchiométrie sur les propriétés physiques du multiferroïque BiFeO3." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00676879.

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Le matériau BiFeO3 (BFO) est le sujet de très nombreuses études fondamentales dans le domaine des matériaux multiferroïques. Cet intérêt est du au fait que cet oxyde présente deux ordres à longue distance à la température ambiante : ferroélectricité et antiferromagnétisme de type G (ce dernier est aussi non colinéaire avec la présence de faible ferromagnétisme ainsi qu'une modulation de spin de type cycloïdale possédant une longueur d'onde de 620 angstrœm). Il est alors possible d'étudier les comportements de couplage entre les propriétés électrique et magnétique. Ce travail concerne principal
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10

Kavanagh, Christopher M. "Synthesis and structure-property relationships in rare earth doped bismuth ferrite." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3555.

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There has been significant interest in BiFeO₃ over the past decade. This interest has focused on the magnetic and electrical properties, which in the long term may prove useful in device applications. This thesis focuses on the synthesis, electrical characterisation, and structural origin of the electrical properties of rare earth doped bismuth ferrite. Two systems have been studied: BiFeO₃ doped with lanthanum and neodymium (Bi₁₋ₓREₓFeO₃ RE= La, Nd). Specific examples have been highlighted focusing on a detailed structural analysis of a lanthanum doped bismuth ferrite, Bi₀.₅La₀.₅FeO₃, and a n
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11

Appert, Florian. "Conception et réalisation de détecteurs dédiés à l'analyse de couches minces par spectrométrie Mossbauer : application à l'étude des propriétés magnétiques de films d'oxydes multiferroïques." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMR133/document.

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Ce travail de thèse porte sur la réalisation de deux instruments adaptés à l’étude de couches minces par spectrométrie Mössbauer du 57Fe par électrons de conversion (CEMS) et à leur utilisation pour la caractérisation de films épitaxiés de ferrite de bismuth BiFeO3 (BFO). Le premier dispositif est constitué d’un compteur proportionnel couplé à un module thermoélectrique. Il permet l’acquisition de manière simple et économique de spectres Mössbauer sur une gamme de température variant de 245 à 375K et sous une induction magnétique externe allant jusqu’à 1,4 T. Un second dispositif a été dévelop
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12

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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13

Jahjah, Walaa. "NanOstructures MultIferroïques INtrinsèques et extrinsèques : vers un contrôle Électrique des propriétés magnétiquEs (NOMINÉE) Influence of mesoporous or parasitic BiFeO3 structural state on the magnetization reversal in multiferroic BiFeO3/Ni81Fe19polycrystalline bilayers, in Journal of Applied Physics 124 (23), December 2018 Spin pumping as a generic probe for linear spin fluctuations: demonstration with ferromagnetic and antiferromagnetic orders, metallic and insulating electrical states, in Applied Physics Express 12(2), January 2019 Thickness dependence of magnetization reversal and magnetostriction in Fe81Ga19 thin films, in Physical Review Applied 12, August 2019." Thesis, Brest, 2019. http://www.theses.fr/2019BRES0070.

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Nous menons trois études expérimentales du comportement de renversement de l’aimantation (RM) dans trois types différents de bicouches, et sous différents types de contraintes. Nous étudions l’influence sur les propriétés magnétiques de l’état structural du BiFe03, de contraintes mécaniques magnétoélastiques dans le Fe81Ga19, couplées ensuite à des contraintes électriques et même thermiques.Une bicouche polycristalline composée d’un ferromagnétique Ni81Fe19, et d’un multiferroïque intrinsèque BiFe03, est déposée par pulvérisation cathodique. Sa structure et sa morphologie sont caractérisées pa
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14

Wang, Junling. "Deposition and characterization of multiferroic BiFeO₃ thin films." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2188.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2005.<br>Thesis research directed by: Material Science and Engineering. 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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15

Bai, Xiaofei. "Effet de taille et du dopage sur la structure, les transitions et les propriétés optiques de particules du multiferroïque BiFeO₃ pour des applications photocatalytiques." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC013/document.

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Ce travail de thèse expérimentale a été consacré à la synthèse par des méthodes de chimie par voie humide de nanoparticules à base du multiferroïque BiFeO3 et à leur caractérisation, avec comme objectif finale des applications photocatalytiques. Ce matériau présente une bande interdite, avec un gap de 2.6eV, qui permet la photo-génération de porteurs de charges dans le visible faisant ainsi de BiFeO3 un système intéressant pour des processus photo-induits. Ce travail s’est en particulier focalisé à caractériser les propriétés de nanoparticules à base de BiFeO3 en vue de comprendre l’effet de s
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16

Lazenka, Vera, Johanna K. Jochum, Michael Lorenz, et al. "Interface induced out-of-plane magnetic anisotropy in magnetoelectric BiFeO3-BaTiO3 superlattices." American Institute of Physics, 2017. https://ul.qucosa.de/id/qucosa%3A31216.

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Room temperature magnetoelectric BiFeO3-BaTiO3 superlattices with strong out-of-plane magnetic anisotropy have been prepared by pulsed laser deposition. We show that the out-ofplane magnetization component increases with the increasing number of double layers. Moreover, the magnetoelectric voltage coefficient can be tuned by varying the number of interfaces, reaching a maximum value of 29 V/cmOe for the20×BiFeO3-BaTiO3 superlattice. This enhancement is accompanied by a high degree of perpendicular magnetic anisotropy, making the latter an ideal candidate for the next generation of data storage
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17

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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18

Dupe, Bertrand. "Propriétés structurales et diélectrique de BiFe03 en couche mince." Phd thesis, Ecole Centrale Paris, 2010. http://tel.archives-ouvertes.fr/tel-00646714.

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Le défis principal de l'industrie de la micro électronique est de créer d'augmenter la capacité de stockage mais aussi la vitesse des ordinateurs. Pour atteindre cette objectif, lkes composants électroniques doivent être miniaturisés à l'échelle du nanomètre. À cette échelle, les propriétés de la matière sont encore mal connues.Les matériaux les plus prometteurs dans cette recherche sont les multiferroïques où l'ordre magnétique et l'ordre ferroélectrique sont couplés. Ils pourraient amener des composants électroniques plus rapide et moins consommateur d'énergie dans des composants tels que le
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19

Bruyer, Emilie. "Propriétés structurales, électroniques et ferroélectriques de systèmes Ln₂Ti₂O₇ (Ln=lanthanides) et d'hétérostructures SrTiO₃ / BiFeO₃." Thesis, Artois, 2012. http://www.theses.fr/2012ARTO0401/document.

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Ce manuscrit est consacré à l’analyse théorique et expérimentale d’oxydes Ln2Ti2O7 (Ln = La, Nd, Sm, Gd) et BiFeO3.Les propriétés physiques de La2Ti2O7 et Nd2Ti2O7 ont été investiguées au moyen de calculs ab initio, confirmant ainsi leur ferroélectricité. D’autres oxydes de la famille Ln2Ti2O7, Sm2Ti2O7 et Gd2Ti2O7, ont ensuite été étudiés selon les mêmes méthodes théoriques. Nos calculs ont révélé une meilleure amplitude de polarisation pour ces composés par rapport au La2Ti2O7 et au Nd2Ti2O7. La deuxième partie de ce travail est consacrée aux propriétés structurales, électroniques et ferroél
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20

Wu, Shan-Lin, and 吳尚霖. "Transport properties of multiferroic BiFeO3 transistors." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/10807390970679908413.

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21

Yang, wei-chun, and 楊偉群. "A-site ion substitution effectin multiferroic BiFeO3 ceramics." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/23922101744104176585.

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碩士<br>輔仁大學<br>物理學系<br>99<br>This work is to investigate the structural, electrical, and magnetic properties of various A-site ion substations in BiFeO3. The samples were fabricated by the solid state reaction method (SSR). The experiment methods include the high-resolution synchrotron XRD, dielectric constant, SEM(grain size), and magnetic properties. The (Bi0.95La0.05)FeO3 and (Bi0.95Nd0.05)FeO3 ceramics exhibit a rhombohedral-orthorhombic-cubic phase transition. The dielectric permittivities of (Bi0.95La0.05)FeO3 and (Bi0.95Nd0.05)FeO3 ceramics are 71.045 and 74.937 at room temperature, re
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Lin, Qi-Rui, and 林其叡. "Domain structures and growth in multiferroic BiFeO3 films." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/08632874787624615705.

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碩士<br>國立成功大學<br>物理學系碩博士班<br>96<br>In this study, I observe the domain structure and growth at nanoscale by the piezoresponse force microscopy (PFM) in the multiferroic BiFeO3 thin films. The topography, in-plane (IP) and out-of-plane (OP) components of domains for BFO thin films can be revealed simultaneously. The effects of free carriers exist at grain boundaries, where free carries are assumed to screen the depolarization fields in rough epitaxial and polycrystalline samples. The effect of free carriers also provide the explanations for that BFO ferroelectric domains are usually larger than
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Chiang, Ming Ta, and 江明達. "Synthesis and Photovoltaic Effects of Multiferroic BiFeO3 Ceramics." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/61967416017836242394.

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碩士<br>輔仁大學<br>物理學系碩士班<br>101<br>In this thesis, the synthesizing process of BiFeO3 (BFO) polycrystalline multiferroic ceramic by solid-state reaction method has been explained systematically. The as prepared BFO ceramic sample shows high purity single phase without any traces of secondary phases. In order to study the photovoltaic effect, ITO/BFO/Au heterostructure (with electrodes of Indium tin oxide and Au films) has been prepared. Photovoltaic responses under near-ultraviolet illumination at λ= 405 nm exhibit nonlinear dependence on light intensity, whereas light illumination at λ = 532 nm
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Tu, Hao-Chun, and 杜浩群. "Photo-Induced Electric Effects on Multiferroic BiFeO3 Ceramics." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/85686199937337909875.

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碩士<br>輔仁大學<br>物理學系<br>100<br>This study used the solid state reaction to produce BiFeO3 multiferroic ceramics. The processes include mixing powders, ball milling, calcining, high -energy ball milling, granulation, pressing, and sintering. XRD of BiFeO3 ceramics show high purity without obvious second phases. Room -temperature dielectric permittivity is about 48 (for f=1 MHz). The maximum dielectric-permittivities occur between 650-800 K and show obvious frequency-dependent dispersion. Dielectric loss increases rapidly when temperature is above 630 K because of the thermal-active conductivity.
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Lee, Yi-Hsien, and 李奕賢. "Crystal growth and characterizations of multiferroic BiFeO3 thin Films." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/79896347569589551198.

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博士<br>國立清華大學<br>材料科學工程學系<br>94<br>Multiferroics BiFeO3 (BFO), exhibiting simultaneously ferroelectricity (Tc~1100K) and anti-ferromagnetism (TN~640K), have attracted extensively attention for their coupled electric, magnetic, and structure order parameters in the same phase. The crystal structure, chemical configuration, nanoscale characterization, electric and magnetic properties were investigated is this study. The pure perovskite phase of BFO films were deposited by rf-magnetron sputtering at low processing temperature. The crystal structure of the BFO films was significantly influenced
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Amrillah, Tahta, and 安泰達. "Multiferroic Properties of BiFeO3-CoFe2O4 Epitaxial Nanocomposite Thin Film." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/22604706933633806236.

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碩士<br>國立交通大學<br>電子物理系所<br>102<br>BFO-CFO vertically align nanocomposite (VAN) was successfully made by utilizing the different wetting conditions from BFO and CFO film when growing on STO substrate at the same time in the PLD system. From the XRD result, there was strain effect from STO substrate to BFO and CFO film. Especially for BFO-CFO/STO VAN, CFO pillar relaxed the strain of BFO film, and shifted magnetic phase transitions on BFO/STO thin film to around 30 K and 160 K as compared to that of BFO powders where the transitions occured around 55 K and 200 K, respectively. From M-T and C-T me
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Bao, Zueng-en, and 鮑正恩. "The ferroelectric property of La and Pb codoped multiferroic BiFeO3." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/72jq57.

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Ding, Jiun-jang, and 丁俊彰. "Synthesis of multiferroic BiFeO3 nanowries by tataric acid gel process." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/70051328437818021438.

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碩士<br>國立成功大學<br>材料科學及工程學系碩博士班<br>97<br>One-dimensional nano-structures have generated considerable interest, due to their unique and superior qualities opposite bulk structures. The investigation in BiFeO3(BFO) material is to transform its morphology into nanowires. The BiFeO3 compound is one of the few materials with coexistent ferroelectricity (TC =810℃) and antiferromagnetism (Neel temperature TN =380℃) at room temperature. Therefore, BFO material is considered to have the great potential for applications in magnetic as well as in ferroelectric devices. Though BiFeO3 was discovered in the 1
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Tung, Chiao-Kai, and 董兆凱. "Influences of strain on multiferroic properties of BiFeO3 thin films." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/60702676746344100953.

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碩士<br>國立交通大學<br>材料科學與工程學系<br>98<br>Magnetoelectric multiferroic materials which have coupled electric, and magnetic, that result ferroelectricity and ferromagnetism . These compounds are explored in transition-metal-oxide that present great opportunities for applications in information storage, sensors and green materials. BiFeO3 (BFO)is a room-temperature , single- phase magnetoelectric multiferroic which present ferroelectric polarizations along &amp;lt;111> directions and G-type anti-ferromagnetism . Our study suggests an isostructural change can be induced by epitaxial strain, which is usu
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TengChi, Lin, and 林灯祺. "Phase Transition and BaTiO3-Doping Effect in Multiferroic BiFeO3 Ceramics." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/05908433999197058974.

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碩士<br>輔仁大學<br>物理學系<br>98<br>In-situ high-resolution synchrotron X-ray diffraction reveals a local minimum in rhombohedral distortion angle αR (associated with an inflection in the lattice constant aR) in the region of 350 ~ 400 oC in BiFeO3 (BFO) and 5 mol% BaTiO3-doped BiFeO3 (BiFeO3(0.95)-BaTiO3(0.05)). It confirms a coupling of ferroelectric and magnetic parameters near the Néel temperature, which is responsible for frequency-dependent maxima in dielectric permittivity. A rhombohedral–cubic structure transition occurs near 850 and 830 oC in BiFeO3 and BiFeO3(0.95)-BaTiO3(0.05), respectively
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Wang, Tzu Hsiang, and 王子翔. "Synthesis and Characterization of (Ba,Ti) Substituted BiFeO3 Multiferroic Ceramics." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/26720423799274273711.

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博士<br>輔仁大學<br>應用科學與工程研究所博士班<br>100<br>A one-dimensional conductivity barrier model with intrinsic barrier B every lattice constant a and extrinsic barrier B+Δ is introduced to describe the dielectric response and conductivity as functions of temperature and frequency. Temperature- and frequency-dependent dielectric permittivity (ε′) and conductivity (σ′) have been studied on multiferroic BiFeO3 (BFO), (1-x)BiFeO3-(x)BaTiO3 (BFO-BT), and (Bi1-xBax)(Fe1-xTix)O3 [BFO-(Ba,Ti)] ceramics, which were synthesized by the solid state reaction method. A frequency-dependent dispersion of dielectric max
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32

Kothai, V. "On the Factors Influencing the Stability of Phases in the Multiferroic System BiFeO3-PbTiO3." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3949.

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Rhombohedral perovskite BiFeO3 is a single phase multiferroic compound exhibiting both magnetic (Neel temperature ~370˚C) and ferroelectric (Curie point ~840˚C) ordering well above the room temperature. Ferroelectricity in BiFeO3 is due to stereochemically active 6slone pair in Biion which causes large relative displacements of Bi and O ions along the [111] direction. Long range spiral modulation of the canted antiferromagnetic spin arrangement in Feeffectively cancels the macroscopic magnetization due to Dzyaloshinskii–Moriya interaction and thereby prevents linear magneto-electric effect. S
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33

Kothai, V. "On the Factors Influencing the Stability of Phases in the Multiferroic System BiFeO3-PbTiO3." Thesis, 2015. http://etd.iisc.ernet.in/2005/3949.

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Rhombohedral perovskite BiFeO3 is a single phase multiferroic compound exhibiting both magnetic (Neel temperature ~370˚C) and ferroelectric (Curie point ~840˚C) ordering well above the room temperature. Ferroelectricity in BiFeO3 is due to stereochemically active 6slone pair in Biion which causes large relative displacements of Bi and O ions along the [111] direction. Long range spiral modulation of the canted antiferromagnetic spin arrangement in Feeffectively cancels the macroscopic magnetization due to Dzyaloshinskii–Moriya interaction and thereby prevents linear magneto-electric effect. S
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34

Yan, Wei-De, and 顏維德. "Cobalt-Doping Effects on Photovoltaic and Structural Properties in BiFeO3 Multiferroic Ceramics." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/86161909726900075810.

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碩士<br>輔仁大學<br>物理學系碩士班<br>102<br>In this research, 5% and 10% Co-doped BFO multiferroic ceramics have been synthesized by solid state reaction (SSR) method with various sintering temperature and present single phase in XRD measurements. The average grain size of Co-doped BFO observed by SEM grows significantly as increasing sintering temperature. The ferromagnetic behavior at room temperature is enhanced as cobalt doped in BFO and grains demonstrate more rectangle shape with increasing Co content. The temperature- and frequency- dependent dielectric permittivity of Co-doped BFO show strong freq
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35

Yang, Jan-Chi, and 楊展其. "Advanced Engineering of Multiferroic BiFeO3: A Roadmap from Domain Wall, Structure to Functionalities." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/26131191070456830385.

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博士<br>國立交通大學<br>材料科學與工程學系所<br>103<br>Multiferroics - materials that exhibit coexistence of different ferroic order parameters - have offered a new route to create intriguing functionalities for next generation nanoelectronics. Bismuth ferrite, BiFeO3, is currently the most studied single-phase multiferric, because BiFeO3 is the only room temperature multiferroic in the world to date. In this dissertation, domain engineering of BiFeO3 is explored to create well-controlled domain patterns and desired domain walls, which are used to gain further understanding on the intriguing functionalities of
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36

Sil, Anomitra. "Structural, Magnetic and Electrical Studies of Multiferroic BiFeO3 and CuO Epitaxial Thin Films." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4368.

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The multiferroics are an important class of multifunctional material which simultaneously possess spontaneous ferroelectric polarization and magnetic ordering. If there exists a coupling between the ferroelectricity and the magnetic ordering, the materials are known as magneto electric (ME) multiferroic materials. The coupling between the magnetic and electric order parameters allows to tune the magnetic properties by an electric field and vice versa. Multiferroic materials are promising candidate for designing new spintronic devices, advanced sensors, high density ferroelectric memory devices
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Wójcik, Katarzyna. "The synthesis, structure and reactivity of iron-bismuth complexes : Potential Molecular Precursors for Multiferroic BiFeO3." Doctoral thesis, 2009. https://monarch.qucosa.de/id/qucosa%3A19322.

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The thesis presented here is focused on the synthesis of iron-bismuth alkoxides and siloxides as precursors for multiferroic BiFeO<sub>3</sub> systems. Spectrum of novel cyclopentadienyl substituted iron-bismuth complexes of the general type [{Cp<sup>y</sup>(CO)<sub>2</sub>Fe}BiX<sub>2</sub>], as potential precursors for cyclopentadienyl iron-bismuth alkoxides or siloxides [{Cp<sup>y</sup>(CO)<sub>2</sub>Fe}Bi(OR)<sub>2</sub>] (R-O<sup>t</sup>Bu, OSiMe<sub>2</sub><sup>t</sup>Bu), were obtained and characterised. The use of wide range of cyclopentadienyl rings in the iron carbonyl compounds all
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38

Tripathy, Satya Narayan. "Phase Transition and Magnetoelectric Properties of BiFeO3-RMnO3 (R: Y3+, Gd3+, Dy3+) and Bi1-xBaxFe1-xZrxO3 Multiferroic Nanoceramics." Thesis, 2015. http://ethesis.nitrkl.ac.in/6680/1/Satya_N._Tripathy.pdf.

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Magnetoelectric multiferroics have triggered the attention of scientific community because of their intriguing fundamental physics and novel multifunctional device applications. BiFeO3 has been established as a prototype multiferroic materials having perovskite structure. However, the potentials of this material are yet to be realized due to several difficulties in synthesis, characterization and attaining the desired value of magnetoelectric coupling. The physical properties and the phase transition of this material vary as a function of intensive parameters (i.e., temperature, frequency, pre
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39

Saha, Surajit. "Phonon Anomalies And Phase Transitions In Pyrochlore Titanates, Boron Nitride Nanotubes And Multiferroic BiFeO3 : Temperature- And Pressure-Dependent Raman Studies." Thesis, 2010. https://etd.iisc.ac.in/handle/2005/2244.

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This thesis presents experimental and related theoretical studies of pyrochlore titanate oxides, boron nitride nanotubes, and multiferroic bismuth ferrite. We have investigated these systems at high pressures and at low temperatures using Raman spectroscopy. Below, we furnish a synoptic presentation of our work on these three systems. In Chapter 1, we introduce the systems studied in this thesis, viz. pyrochlores, boron nitride nanotubes, and multiferroic BiFeO3, with a review of the literature pertaining to their structural, electronic, vibrational, and mechanical properties. We also bring
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40

Saha, Surajit. "Phonon Anomalies And Phase Transitions In Pyrochlore Titanates, Boron Nitride Nanotubes And Multiferroic BiFeO3 : Temperature- And Pressure-Dependent Raman Studies." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/2244.

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This thesis presents experimental and related theoretical studies of pyrochlore titanate oxides, boron nitride nanotubes, and multiferroic bismuth ferrite. We have investigated these systems at high pressures and at low temperatures using Raman spectroscopy. Below, we furnish a synoptic presentation of our work on these three systems. In Chapter 1, we introduce the systems studied in this thesis, viz. pyrochlores, boron nitride nanotubes, and multiferroic BiFeO3, with a review of the literature pertaining to their structural, electronic, vibrational, and mechanical properties. We also bring o
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41

Wójcik, Katarzyna [Verfasser]. "The synthesis, structure and reactivity of iron-bismuth complexes : potential molecular precursors for multiferroic BiFeO3 / vorgelegt von Katarzyna Wójcik." 2010. http://d-nb.info/1007641886/34.

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42

Allen, Marc Alexander. "Theoretical determination of electric field-magnetic field phase diagrams of the multiferroic bismuth ferrite." Thesis, 2014. http://hdl.handle.net/1828/5628.

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Bismuth ferrite (BFO) is a multiferroic material with cross-correlation between magnetic and electric orders. With no applied external fields the spin structure of BFO is anitferromagnetic and cycloidal. This ordering prevents the detection of the weak ferromagnetism known to exist in the material. The application of magnetic and electric fields of suitable strength and direction is capable of compelling the Fe3+ spins to align in a homogeneous, antiferromagnetic fashion. This report details how numerical methods were used to simulate the spin alignment of a BFO system under different fiel
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43

Allen, Marc Alexander. "Theoretical investigation of size effects in multiferroic nanoparticles." Thesis, 2020. http://hdl.handle.net/1828/11972.

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Over the last two decades, great progress has been made in the understanding of multiferroic materials, ones where multiple long-range orders simultaneously exist. However, much of the research has focused on bulk systems. If these materials are to be incorporated into devices, they would not be in bulk form, but would be miniaturized, such as in nanoparticle form. Accordingly, a better understanding of multiferroic nanoparticles is necessary. This manuscript examines the multiferroic phase diagram of multiferroic nanoparticles related to system size and surface-induced magnetic anisotropy. Th
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44

Agrawal, Binit Kumar. "Synthesis of Multiferroic $BiFeo_3$ Material by Autocombustion Technique." Thesis, 2009. http://ethesis.nitrkl.ac.in/1315/1/synthesis_of_multiferroic_BiFeO3_material_by_autocombustion_technique.pdf.

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One of the most widely used and useful method of preparation of BFO is the combustion synthesis route using a fuel.The fuel used may be glycine ,citric acid or urea.the precursor material used for the synthesis of BFO by autocombustion route are $BiNO_3$ and $FeNO_3$ solutions with a certain concentration level. Combustion synthesis is becoming one of the most popular methods for the preparation of a wide variety of materials, .The main advantage of using this tchnique is due to the simplicity, the broad applicability range, the self-purifying feature due to the high temperatures involved,
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45

Chang, Chih-Chia, and 張志嘉. "Fabrication and Characterization of Si-doped or La-doped BiFeO3 Multiferroics Thin Films." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/68061565606033552667.

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碩士<br>國立成功大學<br>材料科學及工程學系碩博士班<br>94<br>Multiferroics BiFeO3 (BFO) thin films which simultaneously coexists ferroelectricity and antiferromagnetism, have attracted extensively attention to applying on memory, tunable sensor and spin transistor. Because of the significant leakage of BiFeO3, the ferroelectric hysteresis can’t measure at room temperature. Si-doped and La-doped BFO thin films were deposited LaNiO3/Si substrates by chemical solution method in this study. Doping effects on crystal structure, leakage current, dielectric, ferroelectric and magnetic properties were investigated. Becau
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46

Schwinkendorf, Peter. "Magnetoelektrische Kopplung in BaTiO3- und BiFeO3-Kompositschichten und Leitfähigkeitsphänomene in Sr2FeMoO6-Dünnschichten." 2017. https://ul.qucosa.de/id/qucosa%3A21173.

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Die vorliegende Arbeit befasst sich mit Züchtung und Untersuchung von dünnen Kompositschichten aus BaTiO3 und BiFeO3 sowie Sr2FeMoO6-Dünnschichten. Diese Materialien haben gemeinsam, dass sie Bausteine in neuartigen elektronischen Bauelemente z. B. in Computerspeicher-Modulen werden könnten. BiFeO3 ist ein magnetoelektrisches Multiferroikum bei Raumtemperatur, was bedeutet, dass es sowohl eine spontane magnetische als auch eine spontane ferroelektrische Ordnung besitzt. Zusätzlich sind diese aneinander gekoppelt (magnetoelektrisch). Das macht BiFeO3 zu einem sehr begehrten Forschungsobjekt. Da
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47

Hohenberger, Stefan. "Magnetoelectric Coupling in BaTiO3-BiFeO3 Multilayers: Growth Optimization and Characterization." 2020. https://ul.qucosa.de/id/qucosa%3A73842.

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The presented thesis explores the magnetoelectric (ME) coupling in multiferroic thin film multilayers of BaTiO3 (BTO) and BiFeO3 (BFO). Multiferroics possess more than one ferroic order parameter, in this case ferroelectricity and anti-ferromagnetism. Cross-coupling between these otherwise separate order parameters promises great advantages in the fields of multistate memory, spintronics and even medical applications. The first major challenge in this field of study is the rarity of multiferroics. Second, most known multiferroics, both intrinsic and extrinsic in nature, possess very low ME cou
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48

Ghosh, Sharmistha. "DIELECTRIC RELAXATION SPECTROSCOPY AND ELECTRO-OPTICAL STUDIES OF ANTIFERROELECTRIC AND FERROELECTRIC LIQUID CRYSTALS AND LIQUID CRYSTAL NANO-COMPOSITES." Thesis, 2019. http://hdl.handle.net/10821/8328.

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Blending nanomaterials with liquid crystal (LC) is considered to be a prospective method to enhance the electro-optical properties of the host. Threshold voltage, driving voltage, residual dc, response time and rotational viscosity etc. are found to decrease in nano doped LC system and in turn the anisotropic order of the liquid crystalline host imparts order in the nano-sized guest particles. Proper selection of size, shape and crystallographic phase of nanomaterial is important to achieve desired improvements of the host. This dissertation presents results of doping different type of nanomat
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