Academic literature on the topic 'Magnetism in insulating solids'

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Journal articles on the topic "Magnetism in insulating solids"

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Ohtomo, Akira, Suvankar Chakraverty, Hisanori Mashiko, Takayoshi Oshima, and Masashi Kawasaki. "Spontaneous atomic ordering and magnetism in epitaxially stabilized double-perovskites." MRS Proceedings 1454 (2012): 3–13. http://dx.doi.org/10.1557/opl.2012.923.

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ABSTRACTWe report on the atomic ordering of B-site transition-metals and magnetic properties in double-perovskite oxides, La2CrFeO6 (LCFO) and La2VMnO6 (LVMO), which have never been reported to exist in ordered forms. These double-perovskite oxides are particularly interesting because of possible ferromagnetism (expected from the Kanamori-Goodenough rule for LCFO) and half-metallic antiferromagnetism (predicted for LVMO). Using pulsed-laser deposition technique with single solid-solution targets, we have prepared epitaxial films in ordered forms. Despite similar ionic characters of constituent transition-metals in each compound, the maximum B-site order attained was surprisingly high, ∼90% for LCFO and ∼80% for LVMO, suggesting a significant role of epitaxial stabilization in the spontaneous ordering process. Magnetization and valence state characterizations revealed that the magnetic ground state of both compounds was coincidently ferrimagnetic with saturation magnetization of ∼2μBper formula unit, unlike those predicted theoretically. In addition, they were found to be insulating with optical band-gaps of 1.6 eV and 0.9 eV for LCFO and LVMO, respectively. Our results present a wide opportunity to explore novel magnetic properties of binary transition-metal perovskites upon epitaxial stabilization of the ordered phase.
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Wang, D. Y., L. Liu, Y. B. Liu, T. Li, Z. Ma, and H. X. Wu. "Heat insulating capacity of Sm2Zr2O7 coating added with high absorptivity solids." Ceramics International 43, no. 2 (February 2017): 2884–87. http://dx.doi.org/10.1016/j.ceramint.2016.11.068.

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Brau, A., J. P. Farges, and F. Ali-Sahraoui. "Investigation versus temperature of highly conducting compacted mixtures of insulating reactive solids." Synthetic Metals 27, no. 3-4 (December 1988): 71–76. http://dx.doi.org/10.1016/0379-6779(88)90126-9.

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MOHN, P., and K. SCHWARZ. "ITINERANT MAGNETISM IN SOLIDS." International Journal of Modern Physics B 07, no. 01n03 (January 1993): 579–84. http://dx.doi.org/10.1142/s0217979293001219.

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Based on the spin-density functional theory we discuss the essential mechanism of spin-split itinerant electrons which cause the formation of spin-magnetic moments in a solid. The success and the difficulties of the Stoner model of itinerant magnetism is shown for hcp Co. The FSM (fixed spin moment) method allows us to compute the total energy as a function of volume and magnetic moment, E(M, V). These energy surfaces contain the crucial information about magneto-volume instabilities and related phenomena. At finite temperatures collective phenomena such as spin fluctuations are important which can be treated with a Landau—Ginzburg formalism. Results are given for the finite temperature properties of the strongly enhanced Pauli paramagnet fcc Pd and the metamagnetic system YCo2.
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Can, T. V., M. A. Caporini, F. Mentink-Vigier, B. Corzilius, J. J. Walish, M. Rosay, W. E. Maas, et al. "Overhauser effects in insulating solids." Journal of Chemical Physics 141, no. 6 (August 14, 2014): 064202. http://dx.doi.org/10.1063/1.4891866.

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Verdaguer, Michel, and Alain N. Gleizes. "Magnetism: Molecules to Build Solids." European Journal of Inorganic Chemistry 2020, no. 9 (February 18, 2020): 723–31. http://dx.doi.org/10.1002/ejic.201901274.

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Esquinazi, Pablo, Wolfram Hergert, Daniel Spemann, Annette Setzer, and Arthur Ernst. "Defect-Induced Magnetism in Solids." IEEE Transactions on Magnetics 49, no. 8 (August 2013): 4668–74. http://dx.doi.org/10.1109/tmag.2013.2255867.

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Varret, François, Kamel Boukheddaden, Epiphane Codjovi, and Antoine Goujon. "Molecular Switchable Solids: towards photo-controlled magnetism." Hyperfine Interactions 165, no. 1-4 (October 26, 2006): 37–47. http://dx.doi.org/10.1007/s10751-006-9244-2.

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Esquinazi, P., W. Hergert, D. Spemann, A. Setzer, and A. Ernst. "ChemInform Abstract: Defect-induced Magnetism in Solids." ChemInform 44, no. 23 (May 16, 2013): no. http://dx.doi.org/10.1002/chin.201323229.

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Esquinazi, Pablo, Wolfram Hergert, Daniel Spemann, Annette Setzer, and Arthur Ernst. "ChemInform Abstract: Defect-Induced Magnetism in Solids." ChemInform 45, no. 1 (December 12, 2013): no. http://dx.doi.org/10.1002/chin.201401236.

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Dissertations / Theses on the topic "Magnetism in insulating solids"

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Bramwell, Steven Thomas. "Neutron scattering, magnetometry and optical spectroscopy of Rb←2CrCl←4, Rb←2CrCl←3Br, Rb←2CrCl←2Br←2 and Rb←2CrCl←2I←2." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279833.

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Tremas, Laure. "Pre-breakdown and breakdown phenomena in air along insulating solids." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT117.

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Compréhension et maîtrise des phénomènes intervenant sous haute tension à l'interface entre un gaz et un isolant solide.Dans le cadre du remplacement du SF6 dans les appareils moyenne tension, une étude de l’isolation électrique mixte (gaz (air) / solide isolant) a été réalisée. L’objectif étant de déterminer l’influence de la nature du solide sur la tenue au claquage. Pour cela plusieurs matériaux ont été sélectionnés tel que l’époxy / silice (matériau de référence chez Schneider Electric), le PA6T/66.GF50 (nouveau matériau pour cette application) ainsi que plusieurs autre matériaux permettant une meilleure compréhension du phénomène (PTFE, PC, PP, …). Les caractérisations diélectriques ont permis de mesurer des déclins de potentiel, des courants volumiques ainsi que des permittivités en fonction de la nature des matériaux. A partir de ces données, des mesures de claquage ont été effectuées. Deux configurations de champ électrique ont été testées (parallèle et perpendiculaire au solide). La géométrie « pointe-plan » a été sélectionnée, permettant l’observation de décharges partielles avant le claquage et donc une étude de la propagation de la décharge et non de l’initiation de celle-ci. Ces mesures ont permis de déterminer l’influence du solide sur la tension de claquage, avec une influence indirecte de la nature du matériau et sa teneur en eau. Dans notre configuration, la présence d’un isolant solide dégrade la tenue diélectrique. La permittivité est le paramètre influençant la tension de claquage, avec une réduction de celle-ci en présence de matériaux à forte permittivité (comme l’alumine). Aucun lien n’a pu être mis en évidence entre les mesures de déclin de potentiel et les tensions de claquage. Pour caractériser le développement de la décharge électrique le long de l’isolant solide, des visualisations et des mesures de courant ont été réalisés. Les visualisations ont permis d’observer deux types de décharges menant avant le claquage. Dans un premier temps le développement d’une décharge en surface « streamer de surface », puis celui d’une décharge dans le gaz « streamer de volume ». Ces observations ont permis de conclure que le streamer menant au claquage se développe majoritairement dans l’air en configuration de champ parallèle. Les mesures de courant ont apporté des informations sur l’initiation de la décharge, en montrant une réduction de la tension et du temps d’initiation de la décharge en présence d’un solide. Des résultats semblables ont été obtenus pour une large gamme de matériaux. Cependant certains matériaux de faible permittivité (PP, PTFE) se distinguent avec des tensions et des temps d’initiation retardés et aléatoires, semblables à ceux obtenus dans l’air sans solide. Il a été montré que l’initiation et la propagation n’influencent pas la tension de claquage en géométrie pointe-plan. Celle-ci est déterminée par la transition au claquage.Mots-clés : appareillages moyenne tension, tension de claquage, caractérisation diélectriques, streamers, courant transitoires, visualisations
Comprehension and control of phenomena occurring under high voltage at the interface between a gas and a solid insulator.In the context of SF6 replacement in medium-voltage apparatus, a study of mixed electrical insulation (gas (air) / insulating solid) was carried out. The aim is to determine the influence of the nature of the solid on breakdown voltage. For this purpose several materials have been selected such as epoxy / silica (reference material of Schneider Electric), PA6T / 66.GF50 (new material for this application) and several other materials allowing a better understanding of the phenomenon (PTFE, PC, PP, ...). The dielectric characterizations allowed us to measure potential decay, currents and permittivities according to the nature of the materials. From this data, breakdown measurements have been carried out. Two configurations of electric field were tested (parallel and perpendicular to the solid). The "point-to-plane" geometry was selected, allowing the observation of partial discharges before breakdown and therefore a study of the propagation of the discharge and not of the initiation. These measurements show the influence of the solid on the breakdown voltage, with an indirect influence of the nature of the material and its water content. In our configuration, the presence of a solid insulator lowers the dielectric strength. The relative permittivity is the main parameter influencing the breakdown voltage, with a reduction of it in the presence of materials with high permittivity (alumina). It was not possible to establish a link between surface potential decay measurements and breakdown voltages. In order to characterize the development of the electric discharge along the solid insulation, visualizations and transient current measurements were achieved. The visualizations allowed the observation two types of discharges before the breakdown. First, the development of a surface discharge "surface streamer", followed by a discharge in the gas "volume streamer". These observations lead us concluding that streamers leading to breakdown develop predominantly in air above the surface in the parallel field configuration. Current measurements provide information on the initiation of the discharge. There exists a reduction of voltage and initiation time of the discharge in the presence of a solid. Similar results have been obtained for a wide range of materials. However, several low permittivity materials (PTFE, PP) show a different behaviour, with higher and scattered time delay and initiation voltage, similar to those obtain in air without solid. It has been shown that initiation and propagation do not influence the breakdown voltage in poi nt-plane geometry. The transition to breakdown mainly determines the breakdown voltage.Key words: medium voltage apparatus, breakdown voltage, dielectric characterization, streamers, transient currents, visualizations
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Grånäs, Oscar. "Theoretical Studies of Magnetism and Electron Correlation in Solids." Doctoral thesis, Uppsala universitet, Materialteori, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-172334.

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This work presents new development and applications of ab-initio simulation tools for material science. Focus lies on materials with strong electronic correlation and strong spin-orbit coupling. Improvements on methods for solving the impurity problem in LDA+DMFT is presented, as well as a reliant method for charge self-consistency in a LMTO based electronic structure code. A new adaptive scheme for Brillouin zone integration is developed, where we show a strong reduction of numerical noise compared to standard techniques. A reformulation of the standard LDA+U method aiming to reduce the number of free parameters is introduced. Fast and realistic reduction of the number of free parameters provides the possibility of high throughput calculations and enabled us to study a large number of compounds. An analysis method for polarization in terms of coupled multipoles, and their corresponding energy contributions is developed and applied. This led to the formulation of Katt's rules, a set of rules complementary to Hund's rules. Katt's rules applies for occupying the orbitals of an electronic shell with strong spin-orbit coupling. The analysis is also used to investigate the unconventional Uranium based superconductors URu2Si2, UPt3, UPd2Al3 and UNi2Al3, as well as the high temperature superconductor LaOFeAs. We also investigate the non-magnetic delta-phase of Plutonium, providing insight to the electronic structure and the branching ratios of 4d to 5f transitions seen in photo emission spectra.The influence of surface reconstruction on the magneto crystalline anisotropy is investigated in multilayer Fe/ZnSe, showing that Fe deposited on an unreconstructed interface strongly reduces the uniaxial component of the MAE. We provide a detailed understanding of the magnetic properties of Fe2P, opening possible routes for enhancing the MAE in this system. A general route to strong MAE in nano-laminates is presented, we apply this to propose a candidate with extremely strong anisotropy energy density, 5Fe/2W1-xReX for x=[0.6-0.8].
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Greven, Martin. "Neutron scattering study of magnetism in insulating and superconducting Lamellar copper oxides." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/32649.

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Tothill, J. N. "An investigation into the magnetic properties of certain Mott insulating transition metal compounds close to delocalization." Thesis, University of Bristol, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376619.

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Can, Thach V. (Thach Van). "New methods for dynamic nuclear polarization in insulating solids : the Overhauser effect and time domain techniques." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112433.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 2017.
Cataloged from PDF version of thesis.
Includes bibliographical references.
Dynamic nuclear polarization (DNP) is now established as a powerful technique for improving the sensitivity of NMR signals by several orders of magnitude, enabling otherwise impossible experiments. Unfortunately, the enhancements obtained at high magnetic fields (> 9 T) are only a small fraction of the theoretical limit due to the fact that current DNP mechanisms, including the cross effect and solid effect, utilize continuous wave (CW) microwave irradiation, and scale unfavorably with B0. This has motivated us to develop new DNP methods that do not suffer from the same field dependences. Our first attempt resulted in the observation of the Overhauser effect in insulating solids doped with 1,3-bisdiphenylene-2-phenylallyl (BDPA) or sulfonated-BDPA (SA-BDPA) radical. As opposed to all other CW DNP mechanisms, the enhancement of the OE in insulating solids scales favorably with B0, increasing in magnitude in going from 5 T, to 9.4 T, to 14.1 T, and to 18.8 T. This finding sheds a new light on the seemingly well-understood Overhauser effect. Our second approach is to perform time domain or pulsed DNP, which differs fundamentally from CW DNP, and like CP and INEPT transfers, is in principle independent of B0. In particular, we have investigated the performance of two related pulse sequences including the nuclear orientation via electron spin locking (NOVEL) and integrated solid effect (ISE) at magnetic fields ranging from 0.35 T to 3.35 T. The NOVEL pulse sequence relies on a matching condition between the nuclear Larmor frequency and the electron Rabi frequency, resulting in a fast polarization transfer from electron to protons (hundreds of ns time scale). Furthermore, we showed that adding amplitude modulation to the microwave field, analogous to a ramped CP experiment, led to longer mixing time (ps time scale) but improved the enhancement by a factor of 1.4 to 2. Finally, we implemented a new version of the integrated solid effect (ISE) by modulating the microwave frequency instead of sweeping the B0 which is technically challenging in high field superconducting magnets. In comparison to NOVEL, ISE gives similar DNP enhancement even far below the NOVEL condition. Our study sets the foundation for further development of time domain DNP at high fields.
by Thach V. Can.
Ph. D.
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Zavattoni, Laëtitia. "Conduction phenomena through gas and insulating solids in HVDC gas insulated substations, and consequences on electric field distribution." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT063/document.

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L'émergence des énergies renouvelables a entraîné le développement de nouvelles technologies pour la distribution de l'énergie sur de longues distances. Ces dernières sont basées sur le transport via de hautes tensions continues (HVDC) pour éviter les pertes capacitives. Ce réseau de distribution est interconnecté via des Postes Sous Enveloppes Métalliques (PSEM), dont l'isolation est composée de gaz sous pression (SF6) et d'isolants solides (résine époxy), qui doivent résister sous HVDC. Dans ces dispositifs, le champ électrique n'est plus déterminé par la permittivité relative des matériaux, mais par leurs résistivités et les phénomènes d'accumulation de charges. Dans le cas d'un isolant solide présentant une interface avec un gaz, des électrons ou des ions vont être susceptibles de se déplacer suivant les lignes de champ électrique et charger la surface de l'isolant solide. Le comportement des propriétés des isolants (solides et gazeux) constitue un enjeu majeur dans le développement de PSEM HVDC, notamment dans la compréhension des mécanismes d'accumulation et relaxation des charges.Dans ce travail de thèse, la caractérisation de l'isolant solide a d'abord été étudiée, basée sur des mesures de courants faibles bruits. Il est ainsi possible de mesurer le courant de fuite dans le volume et sur la surface des échantillons, dans une enceinte sous pression, à haut champ électrique et pour différentes températures. Ces mesures ont mis en évidence que les résistivités de volume et de surface sont fortement impactées par l'augmentation de la température et la teneur en eau des échantillons. Il a également été montré que la résistivité de surface a un comportement non-linéaire en fonction du champ électrique. Un modèle numérique a été développé pour simuler les résultats obtenus, et implémenter les propriétés de surface de l'isolant solide.Les propriétés isolantes du gaz ont également été étudiées pour différentes géométries de champ électrique, dans le but d'estimer la contribution du courant passant à travers le gaz, sur l'accumulation de charge en surface de l'isolant solide. Des courants non négligeables sont mesurés dans le gaz (~pA-nA). Pour déterminer les mécanismes responsables de la présence de tels courants, il a été caractérisé selon plusieurs paramètres (la rugosité de la surface de l'électrode, la nature du matériau, le champ électrique, la température et l'humidité relative). Cela a mis en évidence que les variations de courants dépendent du conditionnement du dispositif, et sont donc fortement influencés par l'humidité relative adsorbée sur les surfaces du dispositif (électrodes et cuves). En présence d'un système sec, de faibles courants sont mesurés (~pA), et augmentent en fonction de la température. A l'inverse, dans le cas d'un système humide, le courant diminue avec l'augmentation de la température. Ces résultats, combinés à l'influence de la rugosité de l'électrode, suggèrent fortement un mécanisme d'injection de charge à la surface de l'électrode, favorisé en présence d'eau adsorbée.Enfin, les résultats obtenus pour les deux isolants solides et gazeux sont utilisés pour élaborer un modèle numérique ayant une forme proche de celle de l'application industrielle, et permettent d'observer la modification de la distribution du champ électrique en présence de la concentration en eau et du gradient de température. Une estimation du courant circulant au travers des isolants est donc possible.En conclusion, ce travail donne les variations des résistivités de volume et de surface dans une résine époxy en fonction de la température et du champ électrique. Il met également en évidence la forte influence de l'humidité relative et de la température sur les mécanismes d'injection de charges qui contribuent au courant mesuré à travers le gaz. Cette caractérisation approfondie permet de développer une simulation qui prédit les variations de la distribution du champ électrique au sein d'un PSEM sous tension continue
The emergence of renewable energy leads to a development of new technologies for energy distribution across long distances. The latter will be based on High Voltage Direct Current (HVDC) to avoid capacitance losses. This network is interconnected using Gas Insulated Substation (GIS), which insulation is composed of pressurized gas (SF6) and solid insulators (epoxy resin), which have to withstand HVDC. The electric field is not anymore determined by permittivity of materials, but by resistivities and charge accumulation. In the case of an insulator with an interface with gas, electrons or ions will move across electric field lines and will charge the surface of the solid insulator. The behavior of insulator's properties (gas and solid) constitutes a major challenge for the development of HVDC GIS, to understand the charge relaxation/accumulation mechanisms.In this work, the characterization of solid insulator has first been investigated, based on a low-noise current measurement method. It is thus possible to measure the leakage current through samples and onto their surface, in a pressurized gas, at high electric field and for different temperatures. Those measurements permit to evidence that both volume and surface resistivities are strongly impacted by the increase of temperature and water concentration. It has also been shown that surface resistivity has a non-linear behavior with electric field. A numerical model was developed, to simulate experimental results, showing that the surface properties of the insulator can be implemented.Furthermore, the insulating properties of the gas were also investigated through different electric field geometry (coaxial and uniform), in order to estimate the contribution of current through gas on the charge accumulated on solid insulators. It has been found that a non-negligible current passes through the gas (~pA to nA). To determine the mechanisms responsible for such currents, the latter has been characterized depending on several parameters (electrode surface roughness, material nature, electric field, temperature and relative humidity). It revealed that the variations of currents are strongly impacted by the conditioning of the device and thus by the relative humidity adsorbed on electrodes and enclosure surfaces. In presence of a dry system (dry gas and device) low current were measured (~pA), which increases with temperature. On the contrary, in case of a “wet” system (humid gas and device) the current decreases with increasing temperature. Those results combined with the influence of the electrode roughness, strongly suggest a mechanism of charge injection at the electrode surface, enhanced by water adsorption.Finally, the results obtained for both solid and gaseous insulations are used to develop a numerical model with a shape close to the industrial application, and observe the modification of electric field distribution in presence of water concentration and temperature gradient. An estimation of current flowing through the insulator and gas is thus possible in case of uniform and gradient temperature.In conclusion, this work gives the variations of both volume and surface resistivities in an epoxy resin with temperature and electric field. It also evidences the major influence of relative humidity and temperature on charge injection mechanisms which contribute to the current measured through gas. The extensive characterization performed, enables to develop a simulation which predicts the variations of electric field distribution within an HVDC GIS
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Dooley, Roger Benesh Greg. "Surface magnetism of Ni(001), Co(001), and Fe(001) an embedding Green function approach /." Waco, Tex. : Baylor University, 2007. http://hdl.handle.net/2104/5051.

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Silva, Júnior José Almeida da. "Estudo geral do efeito magnetoelástico simplificado na variação de entropia magnética." Pós-Graduação em Física, 2013. https://ri.ufs.br/handle/riufs/5326.

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In this dissertation we present the main results about the magnetic properties of elastic ferromagnets based on the analysis of different behaviours of the exchange parameter O (or exchange interaction). Firstly, we analyzed the variation of exchange parameter O with H and T , i.e., O vH w , O vT w and O vH,T w , obtaining an additional contribution whitout defined physically origin, vH,T w adic { ´S , which when added to the conventional entropy, conv { ´S , results in the variation of total entropy, total { ´S , obtained by Maxwell¡¦s relation. In what follows, we implement a model that includes a vibrational energy in the Einstein approximation for high temperatures, and an other with a quadratic dependence of the isothermal compressibility with the temperature by means of the relation 2 o T K ­ K y a T , so that obtain an additional contribution with defined physically origin. These additional contributions are obtained by magnetoelastic coupling to rewrite the system in terms of the exchange parameter O x that when applied to the model entropy exchange (proposal by Plaza-Campoy), leads to additional contributions to the { ´S eT curves. In a third approximation, we formulate the O parameter within the RKKY fenomenology, Ë Í o RKKY O ­ O J ç , and analyse the magnetic properties (magnetization, exchange parameter, deformation, magnetic entropy, etc.) for different regions of the RKKY curve. In this fenomenology, the exchange parameter varies in a non linear form as a function of the deformation, although when we get closer to a linear region we verified that the Bean- Rodbell model approximates well the RKKY model. Finally, we start from a generalized exchange Hamiltonian and formulate an generalized exchange energy that inserted in the Gibbs free energy, promotes an additional contribution to the magnetic properties, showing up the importance of the v1 4 w factor in the exchange hamiltonian when the exchange parameter depends on the interatomic distances.
Nesta dissertacao sao apresentados os principais resultados das propriedades magneticas de ferromagnetos elasticos baseados na analise de diferentes comportamentos do parametro de troca O (ou interacao de troca). Primeiramente, analisou-se a variacao do parametro O com H e T , ou seja, O vH w , O vT w e O vH,T w , obtendo-se uma contribuicao adicional sem origem fisica definida, vH,T w adic { ´S , que ao ser somada a entropia convencional, conv { ´S , resulta na variacao de entropia total, total { ´S , obtida a partir da relacao de Maxwell. Em seguida, nos implementamos um modelo que contem uma energia vibracional na aproximacao de Einstein para altas temperaturas, e outro com a dependencia quadratica da compressibilidade isotermica com a temperatura pela relacao v w 2 o T K T ­ K y a T , de forma a obtermos contribuicoes adicionais com uma origem fisica definida. Tais contribuicoes adicionais sao obtidas por meio do acoplamento magnetoelastico ao reescrever o sistema em termos de um parametro de troca O x que ao ser aplicado no modelo da entropia de troca (proposta por Plaza-Campoy), apresentam as contribuicoes adicionais nas curvas de { ´S eT . Em uma terceira aproximacao, formulamos o parametro O na fenomenologia RKKY, Ë Í o RKKY O ­ O J ç , e analisamos as propriedades magneticas (magnetizacao, parametro de troca, deformacao, entropia magnetica) para regioes diferentes da curva oscilatoria da interacao RKKY. Nesta fenomenologia o parametro de troca varia de forma nao linear com a deformacao, porem quando nos aproximamos de uma regiao quase linear verificamos que o modelo de Bean-Rodbell se aproxima bem do modelo RKKY. Por fim, partimos de uma hamiltoniana de troca generalizada e formulamos uma energia de troca generalizada que ao ser inserida na energia livre de Gibbs, promove uma contribuicao adicional nas propriedades magneticas, evidenciando a importancia do fator v1 4 w na hamiltoniana de troca quando o parametro de troca depende das distancias interatomicas.
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Phelan, Daniel Patrick. "Cobaltites : emergence of magnetism and metallicity from a non-magnetic, insulating state /." 2008. http://wwwlib.umi.com/dissertations/fullcit/3283295.

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Books on the topic "Magnetism in insulating solids"

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Solid-state magnetism. New York: Van Nostrand Reinhold, 1991.

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Crangle, John. Solid state magnetism. London: E. Arnold, 1991.

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Guimarães, Alberto Passos. Magnetism and magnetic resonance in solids. New York: Wiley, 1998.

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I, Likhtenshteĭn A., and Postnikov A. V, eds. Magnetism and the electronic structure of crystals. Berlin: Springer-Verlag, 1992.

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1946-, Nasu K., ed. New many-body theories on soft x-ray spectroscopy of insulating solids. River Edge, N.J: World Scientific, 2002.

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Auerbach, Assa. Interacting electrons and quantum magnetism. New York: Springer-Verlag, 1994.

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Magnetism Section of the Italian Condensed Matter Group. Meeting. Fundamental and applicative aspects of disordered magnetism: 1987 Meeting of the Magnetism Section of the Italian Condensed Matter Group, 28-30 October 1987, Rome, Italy. Edited by Allia P, Fiorani D, and Lanotte L. Singapore: World Scientific, 1987.

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Magnetism in the solid state: An introduction. 2nd ed. Berlin: Springer, 2006.

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Magnetism in the solid state: An introduction. Berlin: Springer, 2003.

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Introduction to the physics of electrons in solids. Berlin: Springer, 2011.

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Book chapters on the topic "Magnetism in insulating solids"

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Viola Kusminskiy, Silvia. "Magnetism in Solids." In SpringerBriefs in Physics, 25–44. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13345-0_3.

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Quinn, John J., and Kyung-Soo Yi. "Magnetism in Solids." In Solid State Physics, 247–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-92231-5_9.

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Jin, Hanmin, and Terunobu Miyazaki. "Magnetism of Solids." In The Physics of Ferromagnetism, 97–173. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25583-0_3.

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Quinn, John J., and Kyung-Soo Yi. "Magnetism in Solids." In UNITEXT for Physics, 253–78. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73999-1_9.

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Thompson, Roy, and Frank Oldfield. "Magnetic properties of solids." In Environmental Magnetism, 3–12. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-011-8036-8_2.

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Coey, J. M. D. "Magnetism in Amorphous Solids." In Amorphous Solids and the Liquid State, 433–66. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4757-9156-3_13.

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Brown, David W., Bruce J. West, and Katja Lindenberg. "Response of an Insulating Material to Photoexcitation." In Unconventional Photoactive Solids, 105–13. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0727-3_10.

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Kaminskii, A. A. "Physics and Spectroscopy of Laser Insulating Crystals with Disordered Structure." In Disordered Solids, 343–78. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-5475-8_14.

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Varret, François, Marc Nogues, and Antoine Goujon. "Photomagnetic Properties of Some Inorganic Solids." In Magnetism: Molecules to Materials, 257–95. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2003. http://dx.doi.org/10.1002/9783527620548.ch8.

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Alloul, Henri. "Magnetism of Insulators." In Introduction to the Physics of Electrons in Solids, 231–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13565-1_8.

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Conference papers on the topic "Magnetism in insulating solids"

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Rayman, A., A. Sheik Sidthik, V. Kalai Rajan, A. Senthil Kumar, and G. Lakshmanan. "Analysis of ageing characteristics of solid insulation in mixed insulating fluids." In 2014 Annual International Conference on Emerging Research Areas: Magnetics, Machines and Drives (AICERA/iCMMD). IEEE, 2014. http://dx.doi.org/10.1109/aicera.2014.6908158.

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Maple, M. Brian. "Superconductivity and magnetism in rare earth transition metal borides." In Boron-rich solids. AIP, 1991. http://dx.doi.org/10.1063/1.40865.

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Viertiö, H. E., and A. S. Oja. "Nuclear magnetism in copper at nanokelvin temperatures." In Symposium on quantum fluids and solids−1989. AIP, 1989. http://dx.doi.org/10.1063/1.38799.

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Hetherington, J. H., and M. Roger. "Towards a first principles theory of 3He magnetism." In Symposium on quantum fluids and solids−1989. AIP, 1989. http://dx.doi.org/10.1063/1.38793.

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Guan, Kehong, and Jun Wang. "Variation of intrinsic magnetism and magnetic anisotropy with Boron and silicon content in amorphous (Fe80Ni20)78Si22−xBx alloys." In Boron-rich solids. AIP, 1991. http://dx.doi.org/10.1063/1.40802.

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Ishimoto, H., Hiroshi Fukuyama, T. Fukuda, T. Okamoto, T. Tazaki, K. Sakayori, and S. Ogawa. "Nuclear magnetism of BCC solid 3He in a high magnetic field." In Symposium on quantum fluids and solids−1989. AIP, 1989. http://dx.doi.org/10.1063/1.38791.

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Chakrabarty, Ayan, Alexander Fisher, Elizabeth F. Dreyer, and Stephen C. Rand. "Four-fold Enhancement of Transverse Optical Magnetism in Unstructured Solids." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/cleo_qels.2015.fw3d.4.

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Tong, Chung Yan, Nor Akmal Mohd Jamail, Mohd Haris Asyraf Shee Kandar, Nordiana Azlin Othman, and Qamarul Ezani Kamarudin. "Analysis of Electric Field for HDPE-NR Biocomposite using Finite Element Method." In Conference on Faculty Electric and Electronic 2020/1. Penerbit UTHM, 2020. http://dx.doi.org/10.30880/eeee.2020.01.01.004.

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Abstract:
In developing future electrical networks, it is crucial to develop new alternatives insulating materials which can improve the performance of the next generation high voltage cables. The high electric field reduces the resistance of solid insulation and causes partial discharge occurs through the impurities in a dielectric where this phenomenon causes ageing to the dielectric and ultimately leads to breakdown. Thus, this paper seeks to analyse the electric field intensity of High Density Polyethylene (HDPE) when added with 10%, 20% and 30% of different types of bio-filler such as coconut coir fibre, pineapple leaves fibre, and oil palm empty fruit bunch. This can be achieved by creating a two-dimensional (2D) axisymmetric electrostatic model by using the Finite Element Method Magnetics (FEMM) 4.2 software. The results showed that the inclusion of bio-filler in HDPE increased the maximum electric field intensity when compared with unfilled HDPE. The electric field intensity also varied with the different percentages loading of biocomposite and their permittivity. As a result, the maximum electric field intensity was much lower for HDPE added with a 10% loading of the oil palm empty fruit bunch. Hence, oil palm empty fruit bunch was the best composition as it tends to improve the dielectric properties since it has a lower electric field intensity at the top sphere electrode as compared to other compositions.
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Podor, Balint. "Wigner crystal and other insulating phases of two-dimensional electrons in high magnetic fields." In International Conference on Solid State Crystals 2000, edited by Jaroslaw Rutkowski, Jakub Wenus, and Leszek Kubiak. SPIE, 2001. http://dx.doi.org/10.1117/12.425411.

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Du, B. X., H. J. Liu, and Xinhui Wang. "Effects of magnetic field on tracking failure of gamma-ray irradiated polymer insulating materials." In 2010 10th IEEE International Conference on Solid Dielectrics (ICSD). IEEE, 2010. http://dx.doi.org/10.1109/icsd.2010.5568016.

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