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Добірка наукової літератури з теми "Magnetic Properties - Exotic Transition Metal Oxides"

Автор: Grafiati

Опубліковано: 7 вересня 2023

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Статті в журналах з теми "Magnetic Properties - Exotic Transition Metal Oxides"

Niu, Xu, Bin-Bin Chen, Ni Zhong, Ping-Hua Xiang, and Chun-Gang Duan. "Topological Hall effect in SrRuO₃ thin films and heterostructures." Journal of Physics: Condensed Matter 34, no. 24 (April 14, 2022): 244001. http://dx.doi.org/10.1088/1361-648x/ac60d0.

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Abstract Transition metal oxides hold a wide spectrum of fascinating properties endowed by the strong electron correlations. In 4d and 5d oxides, exotic phases can be realized with the involvement of strong spin–orbit coupling (SOC), such as unconventional magnetism and topological superconductivity. Recently, topological Hall effects (THEs) and magnetic skyrmions have been uncovered in SrRuO3 thin films and heterostructures, where the presence of SOC and inversion symmetry breaking at the interface are believed to play a key role. Realization of magnetic skyrmions in oxides not only offers a platform to study topological physics with correlated electrons, but also opens up new possibilities for magnetic oxides using in the low-power spintronic devices. In this review, we discuss recent observations of THE and skyrmions in the SRO film interfaced with various materials, with a focus on the electric tuning of THE. We conclude with a discussion on the directions of future research in this field.

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ALONSO, J. A., M. J. MARTÍNEZ-LOPE, C. DE LA CALLE, J. SÁNCHEZ-BENÍTEZ, M. RETUERTO, A. AGUADERO, and M. T. FERNANDEZ-DÍAZ. "HIGH-PRESSURE SYNTHESIS AND CHARACTERIZATION OF NEW METASTABLE OXIDES." Functional Materials Letters 04, no. 04 (December 2011): 333–36. http://dx.doi.org/10.1142/s1793604711002123.

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Many transition-metal oxides in elevated valence states [e.g. Mn(V), Co(IV), Ni(III), Cu(III) ] present a metastable character and, given the difficulty of their synthesis, have been relatively little studied. However, they are very interesting materials presenting strong electronic correlations that are bound to exotic properties such as superconductivity, metal behavior, metal–insulator transitions or colossal magnetoresistance. The metastability of these compounds requires special synthesis conditions such as the application of high pressure. In the last years, we have prepared and investigated a good number of materials belonging to several families such as RNiO3 (R = rare earths), Ba3Mn2O8 , (Ba,Sr)CoO3 , La2(Ni,Co)O4+δ , etc. In the study and correct characterization of these oxides it has been decisive the use of elastic neutron diffraction, most of the times in powder samples. This technique has allowed us to access the structural details typically related to the octahedral tilting in perovskite structures, the oxygen stoichiometry and order–disorder of the oxygen sublattice, the distinction between close elements in the Periodic Table, the resolution of magnetic structures and, in general, the establishment of a correlation between the structure and the properties of interest. This letter is organized around the binomial "high-pressure synthesis" and "characterization by neutron diffraction" and illustrated with some selected examples among the metastable materials above mentioned.

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Tokura, Yoshinori. "Optical and magnetic properties of transition metal oxides." Current Opinion in Solid State and Materials Science 3, no. 2 (April 1998): 175–80. http://dx.doi.org/10.1016/s1359-0286(98)80085-5.

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Hattori, Azusa N., Ai I. Osaka, Ken Hattori, Yasuhisa Naitoh, Hisashi Shima, Hiroyuki Akinaga, and Hidekazu Tanaka. "Investigation of Statistical Metal-Insulator Transition Properties of Electronic Domains in Spatially Confined VO2 Nanostructure." Crystals 10, no. 8 (July 22, 2020): 631. http://dx.doi.org/10.3390/cryst10080631.

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Functional oxides with strongly correlated electron systems, such as vanadium dioxide, manganite, and so on, show a metal-insulator transition and an insulator-metal transition (MIT and IMT) with a change in conductivity of several orders of magnitude. Since the discovery of phase separation during transition processes, many researchers have been trying to capture a nanoscale electronic domain and investigate its exotic properties. To understand the exotic properties of the nanoscale electronic domain, we studied the MIT and IMT properties for the VO2 electronic domains confined into a 20 nm length scale. The confined domains in VO2 exhibited an intrinsic first-order MIT and IMT with an unusually steep single-step change in the temperature dependent resistivity (R-T) curve. The investigation of the temperature-sweep-rate dependent MIT and IMT properties revealed the statistical transition behavior among the domains. These results are the first demonstration approaching the transition dynamics: the competition between the phase-transition kinetics and experimental temperature-sweep-rate in a nano scale. We proposed a statistical transition model to describe the correlation between the domain behavior and the observable R-T curve, which connect the progression of the MIT and IMT from the macroscopic to microscopic viewpoints.

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Siwen, Li, Meng Jian, and Ren Yufang. "The electrical and magnetic properties of lanthanide alkaline-earth transition-metal oxides." Materials Research Bulletin 34, no. 10-11 (July 1999): 1569–75. http://dx.doi.org/10.1016/s0025-5408(99)00179-8.

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Du, Yongping, and Xiangang Wan. "The novel electronic and magnetic properties in 5d transition metal oxides system." Computational Materials Science 112 (February 2016): 416–27. http://dx.doi.org/10.1016/j.commatsci.2015.09.036.

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Umek, Polona, Andrej Zorko, and Denis Arcon. "ChemInform Abstract: Magnetic Properties of Transition-Metal Oxides: from Bulk to Nano." ChemInform 42, no. 42 (September 27, 2011): no. http://dx.doi.org/10.1002/chin.201142214.

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Gupta, Akanksha, Rui Zhang, Pramod Kumar, Vinod Kumar, and Anup Kumar. "Nano-Structured Dilute Magnetic Semiconductors for Efficient Spintronics at Room Temperature." Magnetochemistry 6, no. 1 (March 16, 2020): 15. http://dx.doi.org/10.3390/magnetochemistry6010015.

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In recent years, many efforts have been made to develop advanced metal oxide semiconductor nanomaterials with exotic magnetic properties for modern applications w.r.t traditional analogues. Dilute magnetic semiconductor oxides (DMSOs) are promising candidates for superior control over the charge and spin degrees of freedom. DMSOs are transparent, wide band gap materials with induced ferromagnetism in doping, with a minor percentage of magnetic 3d cation to create a long-range antiferromagnetic order. Although significant efforts have been carried out to achieve DMSO with ferromagnetic properties above room temperature, it is a great challenge that still exists. However, TiO2, SnO2, ZnO and In2O3 with wide band gaps of 3.2, 3.6, 3.2 and 2.92 eV, respectively, can host a broad range of dopants to generate various compositions. Interestingly, a reduction in the size of these binary oxides can induce ferromagnetism, even at room temperature, due to the grain boundary, presence of defects and oxygen vacancies. The present review provides a panorama of the structural analysis and magnetic properties of DMSOs based on binary metal oxides nanomaterials with various ferromagnetic or paramagnetic dopants, e.g., Co, V, Fe and Ni, which exhibit enhanced ferromagnetic behaviors at room temperature.

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Maignan, A., W. Kobayashi, S. Hébert, G. Martinet, D. Pelloquin, N. Bellido, and Ch Simon. "Transition-Metal Oxides with Triangular Lattices: Generation of New Magnetic and Electronic Properties." Inorganic Chemistry 47, no. 19 (October 6, 2008): 8553–61. http://dx.doi.org/10.1021/ic8006926.

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Bergo, P., W. M. Pontuschka, J. M. Prison, C.C. Motta, and J. R. Martinelli. "Dielectric properties of barium phosphate glasses doped with transition metal oxides." Journal of Non-Crystalline Solids 348 (November 2004): 84–89. http://dx.doi.org/10.1016/j.jnoncrysol.2004.08.130.

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Дисертації з теми "Magnetic Properties - Exotic Transition Metal Oxides"

Knee, Christopher Sebastian. "Synthesis, structure and magnetic properties of complex metal oxides." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299519.

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Baskar, Dinesh. "High temperature magnetic properties of transition metal oxides with perovskite structure /." Thesis, Connect to this title online; UW restricted, 2008. http://hdl.handle.net/1773/9812.

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Kitada, Atsushi. "Magnetic and Electrical Properties of Transition Metal Oxides Obtained using Structurally Related Precursors." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/157604.

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Kawamoto, Takahiro. "Synthesis and Structural Analysis of Metastable Transition Metal Oxides with Unique Magnetic Properties." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215553.

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Sivakumar, Vikram. "Electrochemical lithiation and delithiation for control of magnetic properties of nanoscale transition metal oxides." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44280.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2008.
Includes bibliographical references (p. 119-124).
Transition metal oxides comprise a fascinating class of materials displaying a variety of magnetic and electronic properties, ranging from half-metallic ferromagnets like CrO2, ferrimagnetic semiconductors like Fey's, and antiferromagnetic insulators like rocksalt-structured FeO. The accessibility of multiple electronic configurations and coordination of cations in these oxides enables the control of magnetism by external stimuli. One such stimulus is the insertion of Li+, as occurs during the discharge cycle of a lithium battery. This can lead to the change in valence and locations of the metal cations within the structure therefore a change in magnetic moment. Fey's and CrO2 are of considerable interest, primarily because they demonstrate room-temperature magnetism and high spin polarization.Previous studies focussed on use of these materials as cathodes and characterization of lithiated compounds made through solid state chemical synthesis or via chemical lithiation. In this work, changes in magnetization and structure of pulsed laser deposition (PLD)-grown Fey's (magnetite) thin films, Fe3O4 nanoparticles, and CrO2 nanoparticles have been investigated upon electrochemical lithiation. The reasonable electrical conductivity of magnetite opens the possibility of modifying the saturation magnetization by inserting Li+ ions into thin films grown on conducting substrates. A substantial decrease in M8 (up to 30%) was observed in PLD-grown thin films. Significantly larger reduction in moment (up to 75%) was observed in commercially available nanoparticles upon addition of 2 moles of Li per formula unit, along with changes in remanence and coercivity. The smaller drop in M8 observed in thin films is attributed to a kinetic effect due to high density and greater diffusion lengths in PLD-grown films.
(cont.) The electrochemical lithiation process has also been applied to needle-shaped particles of chromium dioxide and a model has been proposed to explain the observations. The effects of cycling and discharge-charge rate on these CrO2 particles have been studied. It has been shown that the process may be partially reversible for low Li contents. The effects of increasing the temperature of cycling and decreasing the length of the CrO2 particles have been explored. These changes in magnetic moment may be rendered useful in magnetomechanical or magnetoelectronic applications.
by Vikram Sivakumar.
Ph.D.

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Deka, S. "Studies on the magnetic and electrical properties of nanosized transition metal oxides and ferrites." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2006. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2510.

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Das, Supriyo. "Synthesis and structural, magnetic, thermal, and transport properties of several transition metal oxides and arsenides." [Ames, Iowa : Iowa State University], 2010. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3403075.

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Zhang, Yan. "Theoretical study of the transition-metal oxides Pb2FeMoO6 and ZrO2." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112209.

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Ces dernières années, les oxydes de métaux de transition ont suscité de grands intérêts du point de vue fondamental et technologique. A cet égard, nous nous concentrons sur deux types d'oxydes : le première, le Perovskite double Pb2FeMoO6, avec un potentiel d'application sur des appareils magnétorésistances et spintroniques ; le deuxième, la zircone ZrO2 avec de excellentes propriétés mécaniques et diélectriques pour être utilisée dans les domaines de matériaux structuraux et fonctionnels. Dans la présente étude, nous utilisons la méthode ab-initio (first-principles calculation) pour étudier les détails des orbites décomposés des structures électroniques et des propriétés magnétiques du Pb2FeMoO6 massif de structure parfaite, massif avec des défauts et en structure de plaque. En même temps, les détails des orbites décomposés des structures électroniques, les propriétés mécaniques, dynamiques et diélectriques de six phases de la ZrO2 (cubique, tétragonale, monoclinique, orthorhombique I (Pbca), orthorhombique II (Pnma) et (Pca21)) ont également été étudiés. D'abord nous allons faire les calculs ab-initio sur les propriétés structurales, électroniques et magnétiques de double pérovskite Pb2FeMoO6 massif avec structure parfaite, massif avec défauts et en structure de plaque. La densité des états orbitaux décomposés montre le champ cristallin octaédrique des six atomes d'oxygène autour de métal de transition (des Fe ou des Mo) et divise les cinq états dégénérés des atomes libres de Fe ou Mo dans un états triplement dégénéré t2g (dxy, dyz et dzx) avec une énergie plus faible et dans un états doublement dégénéré eg (dz2 et dx2-y2) avec une énergie plus élevée. La nature semi-métalliques et les propriétés de transport complètes (100%) de spin de polarisation de Pb2FeMoO6 massif et en structures de plaque reflètent un grand potentiel d’application dans les dispositifs magnéto-résistifs et spintroniques. Le caractère semi-métallique est maintenu pour le composé Pb2FeMoO6 désordonné contenant d’antisites Fe(Mo), de lacunes de VFe, VO ou VPb, alors qu'il disparaît quand les antisites Mo(Fe), les échanges entre Fe-Mo ou les lacunes de VMo sont présents même la concentration de défauts est réduite jusqu'à C = 6,25%. Ainsi, les antisites Mo(Fe), les échanges entre Fe-Mo ou les lacunes de VMo doivent être évités afin de préserver le caractère semi-métallique du composé Pb2FeMoO6 et donc être utilisables dans des dispositifs magnéto-résistifs et spintroniques.Ensuite, basé sur la rigidité élastique constantes individuelle calculée Cij de six phases de ZrO2, les propriétés élastiques et mécaniques des agrégats polycristallins ont été prédits. Nous avons donc examiné le caractère isolant de la phase cubique/tétragonale de ZrO2 sous forme film avec différentes combinaisons et différentes épaisseurs possibles dans des plans avec des faibles indices de Miller [(001), (110) et (111)] (pour la phase cubique) et [(001), (100), (110), (101) et (111)] pour la phase tétragonale. Il se trouve que pour les différentes combinaisons et épaisseurs possibles dans ces trois / cinq plans avec faibles indices de Miller, seulement ZrO2-terminé sous forme d’un film orienté dans le plan (110)/(100) et O-terminé sous forme d’un film orienté (111)/(101) des phases cubique/tétragonale de ZrO2 maintiennent le caractère isolant même les épaisseurs d’empilement est réduit jusqu'à deux et trois couches atomiques. Puisque cubique et tétragonale ZrO2 ont grande anisotropie élastique, comme un exemple, le stress et l'énergie de déformation densité ont été calculées pour tous {hkl} -oriented grains d'un film ZrO2 cubique polycristallin
Transition-metal oxides have attracted exceptional research interest in recent years from both fundamental and technological perspectives. In this respect, we focus on two types of oxides, first, the double perovskite, Pb2FeMoO6 for a potential magnetoresistive and spintronics device application, second, zirconia ZrO2 with great mechanical and dielectric properties can be widely used in both structural and functional material fields. In this thesis we use first-principles calculations (ab-initio) to study systematically the detailed orbital-decomposed electronic structures and magnetic properties of Pb2FeMoO6 in the perfected bulk, defected bulk and slab structures. The detailed orbital-decomposed electronic structures, the mechanical, dynamical and dielectric properties of the ZrO2 in six phases (cubic, tetragonal, monoclinic, orthoI (Pbca), orthoII (Pnma) and (Pca21)) have also been studied.Firstly, considering the comparable ionic radius of Pb2+ (1.49Å) with that of Sr2+ (1.44Å), we propose for the first time to substitute Sr2+ ion with Pb2+ ion in Sr2FeMoO6 and a detailed study has been performed on the Pb2FeMoO6 in the perfected bulk, defected bulk and slab structures. The half-metallic nature and a complete (100%) spin-polarized transport properties reflect the bulk and especially slab Pb2FeMoO6 a potential application in magnetoresistive and spintronics devices; The detailed orbital-decomposed density of states show the octahedral crystal-field of the six oxygen atoms around transition-metal Fe or Mo atoms splits the five-fold degenerate states of the free Fe or Mo atoms into triply degenerate t2g (dxy, dyz and dzx) states with lower energy and doubly degenerate eg (dz2 and dx2-y2) states with higher energy, which cannot be observed in previous partial density of states ( ); The Fe3+ and Mo5+ ions are in the (3d5, s=5/2) and (4d1, s=1/2) states with positive and negative magnetic moments respectively and thus antiferromagnetic coupling via oxygen between them; The half-metallic character is maintained for the disordered Pb2FeMoO6 compounds containing FeMo antisite, VFe, VO, or VPb vacancy, while it vanishes when MoFe antisite, Fe-Mo interchange or VMo vacancy are presented even the defect concentration reduce down to C=6.25%. So the MoFe antisite, Fe-Mo interchange or VMo vacancy defects have to be avoided in order to preserve the half-metallic character of the Pb2FeMoO6 compounds and thus usable in magnetoresistive and spintronics devices.Secondly, based on the calculated individual elastic stiffness constants Cij of six ZrO2 phases, the elastic and mechanical properties of the polycrystalline aggregates have been predicted. We further exam the insulating characters of the cubic/tetragonal ZrO2 slabs with various possible terminations and thicknesses within three [(001), (110) and (111)]/five [(001), (100), (110), (101) and (111)] lower index Miller planes. It is found for the first time that among various possible terminations and thicknesses within these three/five lower index Miller planes, only ZrO2-terminated slabs of the (110)/(100) Miller plane and O-terminated slabs of the (111)/(101) Miller plane of cubic/tetragonal ZrO2 maintain the insulating character and thus usable as a gate dielectric oxide in IC industry even the slab thicknesses reduce down to 2 and 3 atomic layers, respectively; Since cubic and tetragonal ZrO2 have larger elastic anisotropy, both stress and strain energy density have been calculated for all {hkl}-oriented grains of a cubic ZrO2 polycrystalline film as one example

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Yildirim, Oguz. "Effect of microstructure on the magnetic properties of transition metal implanted TiO2 films." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-198820.

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The combined electronic, optic and magnetic properties of transition metal (TM) implanted ferromagnetic TiO2 is of interest for spintronic applications. The nature of the observed abundant ferromagnetism in such materials has been investigated for more than one and a half decades, yet still no clear explanation for its appearance can be given. In this thesis, the origin of the ferromagnetic order in TM:TiO2 systems is studied by investigating the interplay between structural order, defects and incorporation of implanted ions within the host lattice. The defect properties of the host TiO2 are altered by preparing different microstructures of TiO2 (e.g. amorphous, polycrystalline anatase and epitaxial anatase). The difference in microstructure is also found to influence the incorporation of the implanted ions with the host lattice. The crystallographic incorporation of the implanted TM atoms is found only in crystalline films. Moreover, it is observed that the suppression of the dopant related secondary phases can also be achieved by changing the microstructure. The obtained experimental results are compared with the existing theoretical frameworks, while the most relevant one describing our findings is elucidated. Based on this discussion, we propose an ideal microstructural candidate for a dilute magnetic oxide material based on our results
Die kombinierten elektrischen, optischen und ferromagnetischen Eigenschaften von TiO2, welches mit einem Übergangsmetall (TM) dotiert wurde, sind für Anwendungen in der Spintronik von hoher Bedeutung. Obwohl dieses Material seit mehr als anderthalb Jahrzehnten untersucht wird, kann derzeit noch keine eindeutige Erklärung für den beobachteten Ferromagnetismus gegeben werden. In dieser Arbeit wird die Ursache für die ferromagnetische Ordnung in TM:TiO2-Systemen untersucht, indem der Zusammenhang von struktureller Ordnung, Defekten und der Einlagerung der implantierten Ionen im Wirtsgitter analysiert wird. Durch die Verwendung unterschiedlicher Mikrostrukturen (z.B. amorphes, polykristalliner Anatas und epitaktischer Anatas) wurden auch die Defekteigenschaften des Wirts-Titanoxid variiert. Dabei zeigte sich ein Einfluss der unterschiedlichen Mikrostrukturen auf die Einlagerung der implantierten Atome in das Wirtsgitter. So konnte die Substitution von Ti-Atomen durch Atome des dotierten Übergangsmetalls nur in kristallinen Filmen beobachtet werden. Weiterhin wurde herausgefunden, dass die vom Dotanden hervorgerufenen Sekundärphasen durch die initiale Mikrostruktur unterdrückt werden können. Die experimentellen Ergebnisse wurden mit aktuellen Theorien verglichen. Zusammenfassend wird ein Überblick über die wichtigsten Ergebnisse gegeben, auf Basis welcher eine optimale Mikrostruktur für ein verdünntes magnetisches Oxid vorgeschlagen wird

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Schrön, Andreas [Verfasser], Friedhelm [Akademischer Betreuer] Bechstedt, Peter [Akademischer Betreuer] Kratzer, and Diema [Akademischer Betreuer] Ködderitzsch. "Ab-initio studies of the magnetic properties of the 3d transition-metal oxides and their surfaces = Ab-initio-Untersuchungen der magnetischen Eigenschaften der 3d-Übergansmetalloxide und deren Oberflächen / Andreas Schrön. Gutachter: Friedhelm Bechstedt ; Peter Kratzer ; Diema Ködderitzsch." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2015. http://d-nb.info/1075492815/34.

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Книги з теми "Magnetic Properties - Exotic Transition Metal Oxides"

Cao, Gang, and Lance DeLong. Physics of Spin-Orbit-Coupled Oxides. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780199602025.001.0001.

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Prior to 2010, most research on the physics and chemistry of transition metal oxides was dominated by compounds of the 3d-transition elements such as Cr, Mn, Fe, Co, Ni, and Cu. These materials exhibited novel, important phenomena that include giant magnetoresistance in manganites, as well as high-temperature superconductivity in doped La₂CuO₄ and related cuprates. The discovery in 1994 of an exotic superconducting state in Sr₂RuO₄ shifted some interest toward ruthenates. Moreover, the realization in 2008 that a novel variant of the classic Mott metal-insulator transition was at play in Sr₂IrO₄ provided the impetus for a burgeoning group of studies of the influence of strong spin-orbit interactions in “heavy” (4d- and 5d-) transition-element oxides. This book reviews recent experimental and theoretical evidence that the physical and structural properties of 4d- and 5d-oxides are decisively influenced by strong spin-orbit interactions that compete or collaborate with comparable Coulomb, magnetic exchange, and crystalline electric field interactions. The combined effect leads to unusual ground states and magnetic frustration that are unique to this class of materials. Novel couplings between the orbital/lattice and spin degrees of freedom, which lead to unusual types of magnetic order and other exotic phenomena, challenge current theoretical models. Of particular interest are recent investigations of iridates and ruthenates focusing on strong spin-orbit interactions that couple the lattice and spin degrees of freedom.

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Частини книг з теми "Magnetic Properties - Exotic Transition Metal Oxides"

Umek, Polona, Andrej Zorko, and Denis Arčon. "Magnetic Properties of Transition-Metal Oxides: From Bulk to Nano." In Ceramics Science and Technology, 791–833. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527631735.ch19.

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Ma, Pengjun, Qingfen Geng, and Gang Liu. "Photothermal Conversion Applications of the Transition Metal (Cu, Mn, Co, Cr, and Fe) Oxides with Spinel Structure." In Magnetic Spinels - Synthesis, Properties and Applications. InTech, 2017. http://dx.doi.org/10.5772/67210.

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Cao, Gang, and Lance E. DeLong. "Single-Crystal Synthesis." In Physics of Spin-Orbit-Coupled Oxides, 161–78. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780199602025.003.0006.

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Growing single crystals of 4d- and 5d-transition metal oxides is often difficult, as they tend to form incongruently, as well as having high vapor pressure and high melting points. Two crystal growth techniques are commonly used for transition metal oxides—flux and floating-zone techniques; each has advantages and disadvantages. An established capability in both techniques makes it possible to grow single crystals of almost all stable materials. Some basic aspects of both techniques are discussed, and a few general remarks on crystal growth of 4d- and 5d-transition metal oxides are presented. Crystal structures of most 4d- and 5d-transition metal oxides are inherently distorted. An innovative “field-altering” technique is under development, in which an applied magnetic field aligns magnetic moments and, through strong spin-orbit interactions and magnetoelastic coupling, alters crystal structures at high temperatures. Preliminary results show that a field-altering technology is highly effective for resolving physical properties of spin-orbit-coupled oxides.

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Cao, Gang, and Lance E. DeLong. "Current Control of Structural and Physical Properties in Spin-Orbit- Coupled Mott Insulators." In Physics of Spin-Orbit-Coupled Oxides, 135–58. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780199602025.003.0005.

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Electrical current as a means to control structural and related physical properties has been recognized only recently. The application of small electrical currents in sensitive detector and control applications, and in information technologies, is often preferable to other external stimuli. However, until recently it has not been widely accepted that electrical current can readily couple to the lattice, orbital, and spin degrees of freedom. Mounting experimental evidence has indicated that a combination of strong spin-orbit interactions and a distorted crystal structure in magnetic Mott insulators may be sufficient for electrical current to control structural and related properties. Current control of quantum states in 4d- and 5d-transition metal oxides has therefore rapidly expanded as a key research topic. This chapter presents two model systems, Ca₂RuO₄ and Sr₂IrO₄, in which applied current effectively controls the lattice, and thus the physical properties.

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Andriotis, Antonis N., and Madhu Menon. "Successive Spin-Correlated Local Processes Underlying the Magnetism in Diluted Magnetic Semiconductors and Related Magnetic Materials." In Advances in Chemical and Materials Engineering, 13–27. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-5225-0290-6.ch002.

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Recent works have suggested that the defect induced magnetism in Diluted Magnetic Semiconductors (DMSs), Transition Metal Oxides (TMOs) and related materials is facilitated and enhanced by codoping and the synergistic action between the codopants. In the present work we demonstrate that the proposed defect synergy is the result of the interplay among correlated spin-polarization processes which take place in a successive way in neighborhoods centered at the codopants and include their first nearest neighbors. These processes result in a reduction in the superexchange coupling which in turn causes an enhancement in the ferromagnetic coupling (FMC) among the magnetic dopants. The proposed FMC is demonstrated using ab initio calculations of the electronic properties of codoped ZnO, GaN and TiO2.

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Тези доповідей конференцій з теми "Magnetic Properties - Exotic Transition Metal Oxides"

Nishikawa, H. "UV control of electric/magnetic properties of transition metal oxides grown on SrTiO3 single crystal." In 2013 6th International Conference on Advanced Infocomm Technology (ICAIT). IEEE, 2013. http://dx.doi.org/10.1109/icait.2013.6621501.

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Curtin, Paul R., Steve Constantinides, and Patricia Iglesias Victoria. "Fracture Toughness of Samarium Cobalt Magnets." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53435.

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Samarium Cobalt (SmCo) magnets have been the magnet of choice for a variety of industries for many years due to their favorable magnetic properties. Their high coercivity, combined with a low temperature coefficient, make them the ideal permanent magnet for demanding high temperature applications. One of the biggest concerns with rare earth magnets is their brittleness. Samarium Cobalt magnets in particular are prone to fracturing during machining and assembly. In manufacturing, great care must be taken to avoid chipping or fracturing these magnets due to their brittle nature. There are two main grades of Samarium Cobalt magnets, 1:5 and 2:17. These ratios define the nominal ratio of rare earth to transition metal content. In this paper, an investigation is performed on the fracture toughness of permanent magnets based on the Samarium Cobalt 2:17 composition. Various techniques are used to characterize the microstructure of the material, and quantify the material properties. Optical microscopy is used to characterize the grain structure of the material and quantify the porosity of the material after sintering. By comparing the average grain size and fracture toughness of several samples, grain size was shown to not affect fracture toughness in standard material. Latent cracks in defective material showed no preference to follow grain boundaries, oxides inclusions or voids. River marks in fracture surfaces are seen through scanning electron microscopy, confirming the transgranular cracking pattern seen by Li et al [1]This suggests that the toughness of the material is an inherent property of the main phase, not of grain boundaries or contaminants. Samarium Cobalt magnets exhibit both mechanical and magnetic anisotropy due to the alignment of their crystal structure in the manufacturing process. Using Palmqvist indentation crack techniques, the magnetic orientation of the grains was seen to greatly influence the direction of crack propagation from the tip of the indenter. Measurements of fracture toughness using this technique produce highly scattered data due to this anisotropic nature of the material. Specimens loaded with the indenter axis parallel to the direction of orientation show normal Palmqvist cracks, while specimens loaded perpendicular to the direction of magnetization exhibit crack propagation initiating from the faces of the indenter. To better quantify the material’s brittleness, fracture testing is performed on specially prepared samples to obtain an absolute measure of fracture toughness (K1c). Results show that SmCo is measurably weaker than other magnetic materials such as neodymium iron boron magnets[2]. Furthermore, neither relative concentration of Samarium nor source of raw material show notable effect on the fracture toughness of the material.

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Звіти організацій з теми "Magnetic Properties - Exotic Transition Metal Oxides"

Das, Supriyo. Synthesis and structural, magnetic, thermal, and transport properties of several transition metal oxides and aresnides. Office of Scientific and Technical Information (OSTI), January 2010. http://dx.doi.org/10.2172/985308.

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