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Relevant bibliographies by topics / Ferrimagnetic materials

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Academic literature on the topic 'Ferrimagnetic materials'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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Journal articles on the topic "Ferrimagnetic materials"

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Wu, Hao, Felix Groß, Bingqian Dai, David Lujan, Seyed Armin Razavi, Peng Zhang, Yuxiang Liu, et al. "Ferrimagnetic Skyrmions in Topological Insulator/Ferrimagnet Heterostructures." Advanced Materials 32, no. 34 (July 14, 2020): 2003380. http://dx.doi.org/10.1002/adma.202003380.

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Si, Ping-Zhan, Xin-You Wang, Hong-Liang Ge, Hui-Dong Qian, Jihoon Park, Yang Yang, Yin-Sheng Li, and Chul-Jin Choi. "Beating Thermal Deterioration of Magnetization with Mn4C and Exchange Bias in Mn–C Nanoparticles." Nanomaterials 8, no. 12 (December 15, 2018): 1056. http://dx.doi.org/10.3390/nano8121056.

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The magnetization of most materials decreases with increasing temperature due to thermal deterioration of magnetic ordering. Here, we show that Mn4C phase can compensate the magnetization loss due to thermal agitation. The Mn–C nanoparticles containing ferrimagnetic Mn4C and other Mn–C/Mn-O phases were prepared by using the traditional arc-discharge method. A positive temperature coefficient of magnetization (~0.0026 Am2 kg−1 K−1) and an exchange bias up to 0.05 T were observed in the samples. We ascribe the exchange bias to the co-existence of ferrimagnetic Mn4C/Mn3O4 and antiferromagnetic α-Mn(C)/MnO phases. The positive temperature coefficient of magnetization of the samples was ascribed to the presence of Mn4C phase, which is considered as a Néel’s P-type ferrimagnet.

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Zhilyakov, S. M., E. P. Naiden, and G. I. Ryabtsev. "Thermomagnetic phenomena in hexagonal ferrimagnetic materials." Russian Physics Journal 36, no. 10 (October 1993): 944–48. http://dx.doi.org/10.1007/bf00559158.

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Deng, Chenhua, Linjie Hou, and Caifeng Zhang. "Eco-Friendly Ferrimagnetic-Humic Acid Nanocomposites as Superior Magnetic Adsorbents." Materials 14, no. 18 (September 7, 2021): 5125. http://dx.doi.org/10.3390/ma14185125.

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Recyclable, cheap, eco-friendly, and efficient adsorbent materials are very important for the removal of pollution. In this work, we report the design and implementation of ferrimagnetic-humic acid nanocomposites as superior magnetic adsorbent for heavy metals. Ferrimagnetic and ferrimagnetic-humic acid nanocomposite particles with different morphologies were prepared using the coprecipitation method and hydrothermal synthesis method, respectively. The results show that the morphology of the nanoparticles prepared by the coprecipitation method is more uniform and the size is smaller than that by the hydrothermal synthesis method. Adsorption experiments show that the ferrimagnetic-humic acid nanoparticles prepared by the coprecipitation method has high sorption capacity for cadmium, and the maximum adsorption capacity is about 763 μg/g. At the same time, magnetic technology can be used to realize the recycling of ferrimagnetic-humic acid adsorbents.

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Daffé, Niéli, Jovana Zečević, Kalliopi N. Trohidou, Marcin Sikora, Mauro Rovezzi, Claire Carvallo, Marianna Vasilakaki, et al. "Bad neighbour, good neighbour: how magnetic dipole interactions between soft and hard ferrimagnetic nanoparticles affect macroscopic magnetic properties in ferrofluids." Nanoscale 12, no. 20 (2020): 11222–31. http://dx.doi.org/10.1039/d0nr02023k.

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Zhou, Chao, Huixin Bao, Yoshitaka Matsushita, Tieyan Chang, Kaiyun Chen, Yin Zhang, Fanghua Tian, et al. "Thermal Expansion and Magnetostriction of Laves-Phase Alloys: Fingerprints of Ferrimagnetic Phase Transitions." Materials 12, no. 11 (May 30, 2019): 1755. http://dx.doi.org/10.3390/ma12111755.

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The magneto–elastic coupling effect correlates to the changes of moment and lattice upon magnetic phase transition. Here, we report that, in the pseudo-binary Laves-phase Tb1-xDyxCo2 system (x = 0.0, 0.7, and 1.0), thermal expansion and magnetostriction can probe the ferrimagnetic transitions from cubic to rhombohedral phase (in TbCo2), from cubic to tetragonal phase (in DyCo2), and from cubic to rhombohedral then to tetragonal phase (in Tb0.3Dy0.7Co2). Furthermore, a Landau polynomial approach is employed to qualitatively investigate the thermal expansion upon the paramagnetic (cubic) to ferrimagnetic (rhombohedral or tetragonal) transition, and the calculated thermal expansion curves agree with the experimental curves. Our work illustrates the correlation between crystal symmetry, magnetostriction, and thermal expansion in ferrimagnetic Laves-phase alloys and provides a new perspective to investigate ferrimagnetic transitions.

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Kobayashi, T., and Y. Fujiwara. "Magnetization Reversal Time in Ferromagnetic and Ferrimagnetic Materials." Journal of the Magnetics Society of Japan 33, no. 6_2 (2009): 463–66. http://dx.doi.org/10.3379/msjmag.0907mc0002.

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How, H., C. Vittoria, and G. E. Everett. "Amplification factor of echo signals in ferrimagnetic materials." IEEE Transactions on Microwave Theory and Techniques 39, no. 11 (1991): 1828–35. http://dx.doi.org/10.1109/22.97483.

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Seike, Masayoshi, Tetsuya Fukushima, Kazunori Sato, and Hiroshi Katayama-Yoshida. "Computational materials design of defect-induced ferrimagnetic MnO." Journal of Physics: Condensed Matter 26, no. 10 (February 19, 2014): 104205. http://dx.doi.org/10.1088/0953-8984/26/10/104205.

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Sztatisz, J., Cs Novák, M. Balla, and A. Sztaniszláv. "Studies on solid state reactions of ferrimagnetic materials." Thermochimica Acta 93 (September 1985): 445–48. http://dx.doi.org/10.1016/0040-6031(85)85112-1.

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Dissertations / Theses on the topic "Ferrimagnetic materials"

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Dixon, Mark. "Studies of spin and charge momentum densities using Compton scattering." Thesis, University of Warwick, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340475.

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Xie, Shanju. "Magnetic studies of dusts in the urban environment." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367206.

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Ghader, Doried. "Theory for ballistic magnon transport across disordered magnetic nanojunctions." Thesis, Le Mans, 2013. http://www.theses.fr/2013LEMA1020.

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L'objectif de cette thèse est de développer des méthodes théoriques et numériques pour calculer la diffusion d'ondes de spin et leur transport balistique à travers deux types de nanomatériaux magnétiques désordonnés de terres rares - métaux de transition, à savoir le cobalt-gadolinium et le fer-gadolinium, comme éléments constitutifs des systèmes de nanojunctions. La modélisation développée dans ce travail décrit proprement les conséquences du désordre caractéristique de ces systèmes, à savoir de type alliage et celui de type structurel. Les méthodes théoriques et numériques développées servent en particulier à explorer les attributs de ces nanojonctions comme des filtres et des éléments de transmission assistée par résonance dans des dispositifs magnoniques. La thèse développe une version dynamique et non-locale pour l'approximation du potentiel (DNLCPA) afin d'étudier la dynamique de spin des systèmes ultraminces magnétiques désordonnés Fe-Gd et Co-Gd. Les potentiels aléatoires dynamiques de diffusion sont dérivés d'une manière inédite, exploitant les propriétés de phase des excitations de spin élémentaires dans le cadre du formalisme de Dyson. La méthode théorique est ensuite développée en deux manières fondamentales différentes, pour l'appliquer convenablement aux nano systèmes désordonnés qui présentent les types de désordre alliage et structurel. L'approche DNLCPA est ensuite conjuguée avec la théorie de raccordement de phase des champs (PFMT) pour étudier le transport balistique d'ondes de spin à travers les nanojonctions Co-Gd et Fe-Gd entre des gUides d'ondes de Co et Fe respectivement. L'approche PFMT-DNLCPA donne pour la première fois une modélisation des propriétés de diffusion et de transport d'ondes de spin incidents sur les nanojonctions, elle réussit à démontrer, modéliser et à quantifier la perte d'énergie en diffusion balistique due à chaque type de désordre
The aim of this thesis is to develop theoretical and numerical methods to analyze the ballistic spin waves scattering and transport across two types of rare earth - transition metals disordered magnetic nanomaterials, namely the cobalt-gadolinium and the iron-gadolinium types, as building blocks for nanojunction systems. The theoretical computations developed in this work account properly for the consequences of the characteristic disorder present in these systems, whether alloy disorder for the former or structural amorphous-like disorder for the latter. The developed methods serve, in particular, to explore the attributes of these nanojunctions as filters and elements for resonance assisted transmission in a magnonic device. The thesis develops a novel and dynamic non-local version of the coherent potential approximation (DNLCPA), to study the spin dynamics on disordered ultrathin Co-Gd and Fe-Gd magnetic systems. The dynamic random scattering potentials are derived in a completely novel approach, exploiting the phase properties of the elementary spin excitations within the Dyson formalism. This approach is then developed in two different fundamental manners, and applied appropriately for the disordered nanosystems presenting alloy and structural disorder. The DNLCPA approach is incorporated with the phase field matching theory (PFMT) to study the spin waves ballistic transport across the Co-Gd and the Fe-Gd nanojunctions, sandwiched between Co and Fe leads respectively. This PFMT-DNLCPA method yields for the first time the description of the scattering and transport properties for the spin waves incident on the nanojunctions. Furthermore, our computations successfully demonstrate, model and quantify the diffusive energy loss in ballistic scattering due to each type of disorder

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Forbes, Colin Malcolm. "Exploring and developing candidate materials for production of transition metal based synthetic ferrimagnets." Thesis, Queen's University Belfast, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706679.

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Through the exploration and development of candidate materials it was discovered that a a variety of transition metals could be coupled together via a range og non-magnetic materials to produce several synthetic ferrimagnets (SFiM). These SFiM exhibited a wide range of magnetic properties were the optimum SFiM was achieved through coupling the A1 FePt phase to Co via a non-magnetic Ru layer. From the development of these optimum SFiM structures it was found that the multi-layered structures were much more thermally robust in comparison to the tri-layer structures. Through structural analysis it was discovered that this thermal stability was not a result of interlayer mixing or grain growth. Therefore it was demostrated that a variety of SFiM structures could be produced for applications such as all optical switching.

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Le, Guen Marie-Pierre. "Etude et réalisation d'un générateur de courant : application à l'étude des mécanismes d'approche à la saturation dans les tores ferrimagnétiques polycristallins magnétiquement doux." Brest, 1987. http://www.theses.fr/1987BRES2038.

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Conception d'un generateur de courant sinusoidal de periode 20 ms variant de 0 a 100 a, realise autour d'un circuit integre. Application a l'etude de tore en ferrites grenats (yig) et spinelles (nizn) entre la temperature ambiante et la temperature de curie. Verification de la loi de neel pour les materiaux poreux. Observation d'une anomalie pour les materiaux denses. Interpretation des phenomenes

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Albuquerque, Maria Rosa Medeiros Lins de. "Analise dinamica de linhas de microfita e de linhas de laminas sobre substratos ferrimagneticos magnetizados." [s.n.], 1993. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260376.

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Orientadores : Attilio Jose Giarola, Adaildo Gomes D'Assunção
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica
Made available in DSpace on 2018-07-18T14:28:15Z (GMT). No. of bitstreams: 1 Albuquerque_MariaRosaMedeirosLinsde_D.pdf: 4568665 bytes, checksum: 7fd23d68b19953eebceb8e1b0d8653d4 (MD5) Previous issue date: 1993
Resumo: Este trabalho objetiva o estudo do comportamento dispersivo dos modos guiados em linhas de microfita e linhas de lâminas bilaterais sobre substratos ferrimagnéticos magnetizados. A análise é efetuada através do método dos potenciais vetoriais de Hertz em combinação com o método de Galerkin, no domínio espectral. Os campos eletromagnéticos são expandidos em termos dos potenciais vetoriais de Hertz, orientados segundo a direção de magnetização da ferrita, para a determinação das componentes da função diádica de Green da estrutura considerada. Resultados numéricos são apresentados e discutidos. Curvas são obtidas em função de vários parâmetros estruturais e do campo magnético estático externo de polarização aplicado segundo as três orientações do sistema de coordenadas cartesianas. Observa-se concordância com resultados de outros autores. A análise de estruturas de transmissão planares sobre ferritas encontra aplicação no desenvolvimento de dispositivos não-reciprocos para microondas e ondas milimétricas
Abstract: The main objective of this work is to study the frequency behavior of the guided modes in microstrip lines and bilateral finlines on magnetized ferrite substrates. The analysis is performed, in the spectral domain, by using the Hertz vector potentials in conjunction with Galerkin's approach. The electromagnetic waves are expanded in terms of Hertz vector potentials, oriented along ferrite magnetization, to determine the elements of the dyadic Green's function of the considered structure. Numerical results are presented and their features discussed. Curves are obtained as a function of various structural parameters and of the biasing magnetic field applied along the three directions of the cartesian coordinate system. The results are in agreement with those found by other authors. The analysis of the planar transmission structures on ferrites is useful for the development of nonreciprocal devices at microwave and millimeter wave frequencies
Doutorado
Doutor em Engenharia Elétrica

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Jeon, Hyung Min. "Multifunctional Oxide Heterostructures For Next-Generation Tunable RF/Microwave Electronics." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1578950463103112.

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Santos, Cochiran Pereira dos. "Síntese e caracterização de NiFe2O4 e efeitos da dopagem na magnetização de saturação." Universidade Federal de Sergipe, 2011. http://ri.ufs.br:8080/xmlui/handle/123456789/3515.

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The ferrites are a wide class of ferrimagnetic materials with great technological importance and are studied extensively for many decades. Their remarkable magnetic characteristics make it an element often used in induction transformers by his high magnetic permeability, high values of saturation magnetization and low coercivity, resulting in smaller losses in their hysteresis loops. In this work were characterized pure nickel ferrite (NiFe2O4), a soft magnetic material where the magnetic properties depend on the nature of the ions, their charges and their distribution among the tetrahedral and octahedral sites. Heat treatment and sintering time were emphasized. In order to improve one of the most important parameters for such an application, the saturation magnetization, new samples were doped with zinc at various concentrations (Ni1-xZnxFe2O4). Two new series were prepared starting from the higher value of the previous series (Ni0,6Zn0,4Fe2O4) with two new doping, indium and gadolinium. Finally, the values of saturation magnetization and initial permeability could be compared with samples of commercial cores, showing the potential of the compound to be used as the core of magnetic induction.
As ferritas formam uma ampla classe de materiais ferrimagnéticos com grande importância tecnológica e têm sido estudadas exaustivamente ao longo de décadas. Suas notáveis características magnéticas as tornam um elemento frequentemente utilizado em transformadores de indução por sua alta permeabilidade magnética, altos valores de magnetização de saturação e baixa coercividade, resultando em perdas menores observadas em seus ciclos de histerese. Neste trabalho foram caracterizadas ferritas de níquel pura (NiFe2O4), um material magnético mole onde as propriedades magnéticas dependem da natureza dos íons, suas cargas e sua distribuição entre os sítios tetraédricos e octaédricos. Nessa fase o tratamento térmico e o tempo de sinterização tiveram ênfase. A fim de melhorar um dos parâmetros mais importantes para tal aplicação, a magnetização de saturação, foram feitas novas amostras dopadas com zinco em várias concentrações (Ni1-xZnxFe2O4). Duas novas séries foram preparadas partindo-se do maior valor da série anterior (Ni0,6Zn0,4Fe2O4) com dois novos dopantes, o índio e o gadolínio. Finalmente, os valores de magnetização de saturação e permeabilidade inicial puderam ser comparados com amostras de núcleos comerciais, evidenciando a potencialidade do composto em ser utilizado como núcleo de indução magnética.

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Ramesha, K. "Synthesis And Investigation Of Transition Metal Oxides Towards Realization Of Novel Materials Properties." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/264.

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Transition metal compounds, especially the oxides, containing dn (0 ≤ n ≤ 10) electronic configuration, constitute the backbone of solid state/materials chemistry aimed at realization of novel materials properties of technological importance. Some of the significant materials properties of current interest are spin-polarized metallic ferromagnetism, negative thermal expansion, second harmonic nonlinear optical (NLO) susceptibility, fast ionic and mixed electronic/ionic conductivity for application in solid state batteries, and last but not the least, high-temperature superconductivity. Typical examples for each one of these properties could be found among transition metal oxides. Thus, alkaline-earth metal (A) substituted rare-earth (Ln) manganites, Lnı.xAxMnΟ3, are currently important examples for spin-polarized magnetotransport, ZrV2O7 and ZrW2O8 for negative thermal expansion coefficient, KTiOPO4 and LiNbO3 for second harmonic NLO susceptibility, (Li, La) TiO3 and LiMn2O4 for fast-ionic and mixed electronic/ionic conductivity respectively, and the whole host of cuprates typified by YBa2Cu3O7 for high Tc superconductivity. Solid state chemists constantly endeavour to obtain structure-property relations of solids so as to be able to design better materials towards desired properties. Synthesis coupled with characterization of structure and measurement of relevant properties is a common strategy that chemists adopt for this task. The work described in this thesis is based on such a broad-based chemists' approach towards understanding and realization of novel materials properties among the family of metal oxides. A search for metallic ferro/ferrimagnetism among the transition metal perovskite oxides, metallicity and possibility of superconductivity among transition-metal substituted cuprates and second order NLO susceptibility among metal oxides containing d° cations such as Ti(IV), V(V) and Nb(V) - constitute the main focus of the present thesis. New synthetic strategies that combine the conventional ceramic approach with the chemistry-based 'soft1 methods have been employed wherever possible to prepare the materials. The structures and electronic properties of the new materials have been probed by state-of-the art techniques that include powder X-ray diffraction (XRD) together with Rietveld refinement, electron diffraction, thermogravimetry, measurement of magnetic susceptibility (including magnetoresistance), Mossbauer spectroscopy and SHG response (towards 1064 nm laser radiation), besides conventional analytical techniques for determination of chemical compositions. Some of the highlights of the present thesis are: (i) synthesis of new mixed valent [Mn(III)/Mn(IV)] perovskite-type manganites, ALaMn2O6-y (A = K, Rb) and ALaBMn3O9_y (A = Na, K; B = Ca, Sr) that exhibit ferromagnetism and magnetoresistance; (ii) investigation of a variety of ferrimagnetic double-perovskites that include ALaMnRuO6 (A = Ca, Sr, Ba) and ALaFeVO6 (A = Ca, Sr) and A2FeReO6 (A = Ca, Sr, Ba) providing new insights into the occurrence of metallic and nonmetallic ferrimagnetic behaviour among this family of oxides; (iii) synthesis of new K2NiF4-type oxides, La2-2xSr2XCui.xMxO4 (M = Ti, Mn, Fe, Ru) and investigation of Cu-O-M interaction in two dimension and (iv) identification of the structural rnotif(s) that gives rise to efficient second order NLO optical (SHG) response among d° oxides containing Ti(IV), V(V), Nb(V) etc., and synthesis of a new SHG material, Ba2-xVOSi2O7 having the fresnoite structure. The thesis consists of five chapters and an appendix, describing the results of the investigations carried out by the candidate. A brief introduction to transition metaloxides, perovskite oxides in particular, is presented in Chapter 1. Attention is focused on the structure and properties of these materials. Chapter 2 describes the synthesis and investigation of two series of anion-deficient perovskite oxides, ALaMn2O6-y (A = K, Rb, Cs) and ALaBMn3O9_y (A = Na, K; B = Ca, Sr). ALaMn2O6-y (A = K, Rb, Cs) series of oxides adopt 2 ap x 2 ap superstructure for K and Rb phases and √2 av x √2 ap x 2 ap superstructure (ap = perovskite subcell) for the Cs phase. Among ALaBMn3O9-y phases, the A = Na members adopt a new kind of perovskite superstructure, ap x 3 ap, while the A = K phases do not reveal an obvious superstructure of the perovskite. All these oxides are ferromagnetic (Tc ~ 260-325 K) and metallic exhibiting a giant magnetoresistance behaviour similar to alkaline earth metal substituted lanthanum manganites, Lai_xAxMnO3. However, unlike the latter, the resistivity peak temperature Tp for all the anion-deficient manganites is significantly lower than Tc. In Chapter 3, we have investigated structure and electronic properties of double-perovskite oxides, A2FeReO6 (A = Ca, Sr and Ba). The A = Sr, Ba phases are cubic (Fm3m) and metallic, while the A = Ca phase is monoclinic (P2yn) and nonmetallic. All the three oxides are ferrimagnetic with Tcs 315-385 K as reported earlier. A = Sr, Ba phases show a negative magnetoresistance (MR) (10-25 % at 5 T), while the Ca member does not show an MR effect. 57Fe Mossbauer spectroscopy shows that iron is present in the high-spin Fe3+ (S = 5/2) state in Ca compound, while it occurs in an intermediate state between high-spin Fe2+ and Fe3+ in the Ba compound. Monoclinic distortion and high covalency of Ca-O bonds appear to freeze the oxidation states at Fe+3/Re5+ in Ca2FeRe O6, while the symmetric structure and ionic Ba-O bonds render the FeReO6 array highly covalent and Ba2FeReO6 metallic. Mossbauer data for Sr2FeReO6 shows that the valence state of iron in this compound is intermediate between that in Ba and Ca compounds. It is likely that Sr2FeReO6 which lies at the boundary between metallic and insulating states is metastable, phase-seperating into a percolating mixture of different electronic states at the microscopic level. In an effort to understand the occurrence of metallicity and ferrimagnetism among double perovskites, we have synthesized several new members : ALaMnFeO6 (A = Ca, Sr, Ba), ALaMnRuO6 (A = Ca, Sr, Ba) and ALaVFeO6 (A = Ca, Sr) (Chapter 3). Electron diffraction reveals an ordering of Mn and Ru in ALaMnRuO6 showing a doubling of the primitive cubic perovskite cell, while ALaVFeO6 do not show an ordering. ALaMnRuOs are ferrimagnetic (Tcs ~ 200-250 K) semiconductors, but ALaVFeO6 oxides do not show a long range magnetic ordering . The present work together with the previous work on double perovskites shows that only a very few of them exhibit both metallicity and ferrimagnetism, although several of them are ferrimagnetic. For example, among the series Ba2MReO6 (M = Mn, Fe, Co, Ni), only the M = Fe oxide is both metallic and ferrimagnetic, while M = Mn and Ni oxides are ferrimagnetic semiconductors. Similarly, A2CrMoO6 (A = Ca, Sr), A2CrRe06 (A = Ca, Sr), and ALaMnRuO6 (A = Ca, Sr, Ba) are all ferrimagnetic but not metallic. While ferrimagnetism of double perovskites arise from an antiferromagnetic coupling of B and B' spins through the B-O-B' bridges, the occurrence of metallicity seems to require precise matching of the energies of d-states of B and B' cations and a high covalency in the BB'O6 array that allows a facile electron-transfer between B and B', Bn++B’m+↔B(n+1)++B’(m-1)+ without an energy cost, just as occurs in ReO3 and other metallic ABO3 perovskites. In an effort to understand the Cu-O-M (M = Ti, Mn, Fe, Ru) electronic interaction in two dimension, we have investigated K2N1F4 oxides of the general formula La2-2xSr2XCui.xMxO4 (M = Ti, Mn, Fe or Ru). These investigations are described in Chapter 4. For M = Ti, only the x = 0.5 member could be prepared, while for M = Mn and Fe, the composition range is 0 < x < 1.0, and for M = Ru, the composition range is 0 < x ≤ 0.5. There is no evidence for ordering of Cu(II) and M(IV) in the x = 0.5 members. While the members of the M = Ti, Mn and Ru series are semiconducting/insulating, the members of the M = Fe series are metallic, showing a broad metal-semiconductor transition around 100 K for 0 < x ≤ 0.15 that is possibly related to a Cu(II)-O-Fe(IV) < > Cu(III)-O-Fe(III) valence degeneracy. Increasing the strontium content at the expense of lanthanum in La2-2xSr2XCui.xFexO4 for x ≤ 0.20 renders the samples metallic but not superconducting. In a search for inorganic oxide materials showing second order nonlinear optical (NLO) susceptibility, we have investigated several borates, silicates and phosphates containing /ram-connected MO6 octahedral chains or MO5 square-pyramids, where M = d°: Ti(IV), Nb(V) or Ta(V). Our investigations, which are described in Chapter 5, have identified two new NLO structures: batisite, Na2Ba(TiO)2Si4O12, containing trans-connectd TiO6 octahedral chains, and fresnoite, Ba2TiOSi2O7, containing square-pyramidal T1O5. Investigation of two other materials containing square-pyramidal TiO5, viz., Cs2TiOP2O7 and Na4Ti2Si8O22. 4H2O, revealed that isolated TiO5 square-pyramids alone do not cause a second harmonic generation (SHG) response; rather, the orientation of T1O5 units to produce -Ti-O-Ti-O- chains with alternating long and short Ti-0 distances in the fresnoite structure is most likely the origin of a strong SHG response in fresnoite. Indeed, we have been able to prepare a new fresnoite type oxide, Ba2.xVOSi2O7 (x ~ 0.5) that shows a strong SHG response, confirming this hypothesis. In the Appendix, we have described three synthetic strategies that enabled us to prepare magnetic and NLO materials. We have shown that the reaction CrO3 + 2 NH4X > CrO2 + 2 NH3 + H2O + X2 (X = Br, I), which occurs quantitatively at 120-150 °C, provides a convenient method for the synthesis of CrO2. Unlike conventional methods, the method described here does not require the use of high pressure for the synthesis of this technologically important material. For the synthesis of magnetic double perovskites, we have developed a method that involves reaction of basic alkali metal carbonates with the acidic oxides (e.g. Re2O7) first, followed by reaction of this precursor oxide with the required transition metal/transition metal oxide (e.g. Fe/Fe2O3). By this method we have successfully prepared single-phase perovskite oxides, A2FeReO6, ACrMoO6 and ALaFeVO6. We have prepared the new NLO material Ba2_xV0Si207 from Ba2VOSi2O7 by a soft chemical redox reaction involving the oxidation of V(IV) to V(V) using Br2 in CH3CN/CHCI3. Ba2V0Si207 + 1/2 Br2 > Bai.5V0Si207 + 1/2 BaBr2. The work presented in this thesis was carried out by the candidate as part of the Ph.D. training programme. He hopes that the studies reported here will constitute a worthwhile contribution to the solid state chemistry of transition metal oxides and related materials.

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Hellsvik, Johan. "Atomistic Spin Dynamics, Theory and Applications." Doctoral thesis, Uppsala universitet, Materialteori, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-120103.

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The topic of this Thesis is magnetization dynamics on atomic length scales. A computational scheme, Atomistic Spin Dynamics, based on density functional theory, the adiabatic approximation and the atomic moment approximation is presented. Simulations are performed for chemically disordered systems, antiferromagnets and ferrimagnets and also systems with reduced dimensionality The autocorrelation function of the archetypical spin glass alloy CuMn is sampled in simulations following a quenching protocol. The aging regime can be clearly identified and the dependence of the relaxation on the damping parameter is investigated. The time evolution of pair correlation and autocorrelation functions has been studied in simulations of the dilute magnetic semiconductor GaMnAs. The dynamics reveal a substantial short ranged magnetic order even at temperatures at or above the ordering temperature. The dynamics for different concentrations of As antisites are discussed. Antiferromagnets offer opportunities for ultrafast switching, this is studied in simulations of an artificial antiferromagnet. For the right conditions, the cooperative effect of applied field torque and and the torque from the other sublattice enables very fast switching. The dynamics of bcc Fe precessing in a strong uniaxial anisotropy are investigated. It is demonstrated that the magnetization can shrink substantially due to a spin wave instability. The dynamics of a two-component model ferrimagnet at finite temperature are investigated. At temperatures where the magnetic system is close to the magnetic and angular momentum compensations points of the ferrimagnet, the relaxation in a uniaxial easy exis anisotropy resembles results in recent experiments on ferrimagnetic resonance. The different cases of uniaxial or colossal magnetic anisotropy in nanowires at different temperatures are compared. The magnon softening in a ferromagnetic monolayer is investigated, giving results that compare well with recent experiments. The effect of lattice relaxation can be treated in first principles calculations. Subsequent simulations captures the softening of magnons caused by reduced dimensionality and temperature.
Felaktigt tryckt som Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 706

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Books on the topic "Ferrimagnetic materials"

1

Microwave properties of magnetic films. Singapore: World Scientific, 1993.

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2

Sodha, M. S., and N. C. Srivastava. Microwave Propagation in Ferrimagnetics. Springer, 2013.

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3

Exchange Bias: From Thin Film to Nanogranular and Bulk Systems. Taylor & Francis Group, 2017.

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Launay, Jean-Pierre, and Michel Verdaguer. The localized electron: magnetic properties. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814597.003.0002.

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After preliminaries about electron properties, and definitions in magnetism, one treats the magnetism of mononuclear complexes, in particular spin cross-over, showing the role of cooperativity and the sensitivity to external perturbations. Orbital interactions and exchange interaction are explained in binuclear model systems, using orbital overlap and orthogonality concepts to explain antiferromagnetic or ferromagnetic coupling. The phenomenologically useful Spin Hamiltonian is defined. The concepts are then applied to extended molecular magnetic systems, leading to molecular magnetic materials of various dimensionalities exhibiting bulk ferro- or ferrimagnetism. An illustration is provided by Prussian Blue analogues. Magnetic anisotropy is introduced. It is shown that in some cases, a slow relaxation of magnetization arises and gives rise to appealing single-ion magnets, single-molecule magnets or single-chain magnets, a route to store information at the molecular level.

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5

Eriksson, Olle, Anders Bergman, Lars Bergqvist, and Johan Hellsvik. Outlook on Magnetization Dynamics. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198788669.003.0012.

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Since its original formulation in the mid-1990's, atomistic spin-dynamics has become an important tool for modelling of dynamic processes in magnetic materials. So far this book has described current methodological methods and functionalities of atomistic spin-dynamics simulations. Applications of DFT and ASD techniques to selected topics have been presented in this book, for instance methods for calculation of the microscopic Heisenberg and Gilbert parameter from first principles (Chapters 2 and 6), multiscale modelling of magnon spectra in bulk and thin film magnets (Chapter 9), and theoretical investigations of ultrafast switching dynamics in ferromagnets and ferrimagnets (Chapter 10), and of exotic dynamics of topologically protected spin textures (Chapter 11). In this closing chapter we give an outlook on recent and anticipated developments of the methodology.

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Book chapters on the topic "Ferrimagnetic materials"

1

Kis, A. C., Th Leventouri, and J. R. Thompson. "Magnetic and Structural Properties of Ferrimagnetic Bioceramics." In Materials Science, Testing and Informatics II, 117–22. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-957-1.117.

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2

Berkowitz, A. E., R. H. Kodama, S. A. Makhlouf, F. T. Parker, F. E. Spada, E. J. McNiff, and S. Foner. "Anomalous Hysteresis Properties in Ferrimagnetic and Antiferromagnetic Nanoparticles." In Magnetic Hysteresis in Novel Magnetic Materials, 293–307. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5478-9_28.

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3

Pei, Yu, Michel Verdaguer, Olivier Kahn, Jean Pierre Renard, and Jorunn Sletten. "Magnetic Anisotropy Studies of 1d Bimetallic Ferrimagnetic Compounds." In Organic and Inorganic Low-Dimensional Crystalline Materials, 393–96. New York, NY: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4899-2091-1_44.

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4

Gadet, V., M. Bujoli-Doeuff, L. Force, M. Verdaguer, K. Malkhi, A. Deroy, J. P. Besse, et al. "Towards High TC Ferro and Ferrimagnetic BI and Tridimensional Materials from Molecular Precursors." In Magnetic Molecular Materials, 281–95. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3254-1_20.

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5

Coronado, Eugenio, Antonio Barba, Daniel Beltrán, Ramon Burriel, and Richard Carlin. "Design of Low-Dimensional Ferrimagnetic Compounds: New Magnetic Lattices in the “EDTA-Family”." In Organic and Inorganic Low-Dimensional Crystalline Materials, 401–4. New York, NY: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4899-2091-1_46.

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6

Coronado, Eugenio, Paul Robert Nugteren, Marc Drillon, Daniel Beltrán, L. J. de Jongh, and Roland Georges. "Low Temperature Investigation of the Thermal and Magnetic Properties of 1-d Ferrimagnetic Systems." In Organic and Inorganic Low-Dimensional Crystalline Materials, 405–8. New York, NY: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4899-2091-1_47.

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7

Renaudin, J., G. Ferey, M. Zemirli, F. Varret, A. de Kozak, and M. Drillon. "Magnetic Behavior of 1D Helicoidal Chains in Ba7CuFe6F34 a New Kind of Ferrimagnetic 1d System." In Organic and Inorganic Low-Dimensional Crystalline Materials, 389–92. New York, NY: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4899-2091-1_43.

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8

Curély, J., R. Georges, J. C. Gianduzzo, Q. Xu, O. Kahn, Y. Pei, and J. Sletten. "Magnetism of Quantum-Classical Ferrimagnetic Chains Showing Alternate Heisenberg Coupling: Application to MnCu (Obp)(H2O)3, H2O." In Organic and Inorganic Low-Dimensional Crystalline Materials, 413–16. New York, NY: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4899-2091-1_49.

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9

Polyanskii, A. A., X. Y. Cai, D. M. Feldmann, and D. C. Larbalestier. "Visualization of Magnetic Flux in Magnetic Materials and High Temperature Superconductors Using the Faraday Effect in Ferrimagnetic Garnet Films." In Nano-Crystalline and Thin Film Magnetic Oxides, 353–70. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4493-3_33.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of three-dimensional ferrimagnetic material." In Magnetic Properties of Paramagnetic Compounds, 857–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_490.

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Conference papers on the topic "Ferrimagnetic materials"

1

Zervos, T., A. A. Alexandridis, F. Lazarakis, and K. Dangakis. "Patch antenna with polarization agility using ferrimagnetic materials." In 2009 Loughborough Antennas & Propagation Conference (LAPC). IEEE, 2009. http://dx.doi.org/10.1109/lapc.2009.5352431.

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Funada, S., T. Nishimura, Y. Shiota, S. Kasukawa, M. Ishibashi, T. Moriyama, and T. Ono. "Spin Wave Propagation in Ferrimagnetic GdCo." In 2019 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2019. http://dx.doi.org/10.7567/ssdm.2019.ps-9-08.

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Younghun Hwang, Jeongyong Choi, Sunglae Choa, and Sungyoul Choi. "Ferrimagnetic ordering in (FexMn1-x)2As thin films." In 2006 IEEE Nanotechnology Materials and Devices Conference. IEEE, 2006. http://dx.doi.org/10.1109/nmdc.2006.4388782.

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4

Dewar, Graeme. "Applicability of ferrimagnetic hosts to nanostructured negative index of refraction (left-handed) materials." In International Symposium on Optical Science and Technology, edited by Akhlesh Lakhtakia, Graeme Dewar, and Martin W. McCall. SPIE, 2002. http://dx.doi.org/10.1117/12.472980.

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5

Spencer, Mychal P., David Gao, and Namiko Yamamoto. "Scalable Manufacturing of Thermoset Nanocomposites Consisting of Ferrimagnetic Nanoparticles using Static Magnetic Fields." In 2018 AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-1156.

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6

Yamanouchi, M., Y. Mori, J. Hayakawa, H. Yamamoto, K. Miura, H. Hasegawa, K. Ito, et al. "Dielectric Breakdown in MgO-barrier Magnetic Tunnel Junctions with a CoFeB based Synthetic Ferrimagnetic Recording Layer." In 2009 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2009. http://dx.doi.org/10.7567/ssdm.2009.p-12-1.

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7

Mizukami, S., A. Sugihara, and K. Z. Suzuki. "Laser Induced Sub-Terahertz Coherent Spin Dynamics in Ferrimagnetic D0₂₂ Mn₃Ga Films." In 2014 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2014. http://dx.doi.org/10.7567/ssdm.2014.m-1-3.

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8

Camp, Michael, Jurgen Schmitz, Markus Jung, Piotr Laskowski, Steffen Scherr, and Thomas Zwick. "Determining Parameters of Novel Ferrimagnetic Materials for the Design of Electronic Adjustable High Power Non-Linear Transmission Lines." In 2018 International Symposium on Electromagnetic Compatibility (EMC EUROPE). IEEE, 2018. http://dx.doi.org/10.1109/emceurope.2018.8485130.

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Hayakawa, J., H. Yamamoto, S. Ikeda, H. Hasegawa, M. Yamanouchi, K. Ito, H. Takahashi, and H. Ohno. "Annealing Temperature Dependence of Critical Current and Thermal Stability Factor in MgO-Barrier Magnetic Tunnel Junctions with CoFeB based Synthetic Ferrimagnetic Recording Layer." In 2009 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2009. http://dx.doi.org/10.7567/ssdm.2009.k-7-4.

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Xu, Y., D. Chen, S. Tong, H. Chen, X. Qiu, D. Wei, and J. Zhao. "Spin Polarization Characterization by Spin Hall Magnetoresistance in Ferrimagnetic Pt/Co_1-_xTb_x bilayers." In 2019 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2019. http://dx.doi.org/10.7567/ssdm.2019.e-6-02.

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