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Magnetic, electrical and magnetostrictive properties of multiferroic composites and dilute magnetic semiconductors oxides


The investigation of magnetic materials applied to the processing and storage of information has increased in recent decades since the discovery of giant magnetoresistance.. This discovery opened the possibility of using the magnetic properties of materials not only for the storage of information, but also for its processing. Parallel to this, in recent years the possibility of producing multiphase materials, which combine the properties of both ferroelectric and ferromagnetic opened new perspectives for this purpose. The present proposal involves two different classes of materials: composites multiferroic oxides and diluted magnetic oxide semiconductors. The first class we will investigated using various techniques are magnetic and electrical transport in particular measures magnetization, magnetostriction effect and magnetoelectric, as a function of temperature, magnetic field and field drivers. Expected to be able to better understand the mechanisms coupling between electric and magnetic composites in PMN-PT with ferrites of nickel and cobalt. The second class of materials to be investigated are oxide semiconductors, such as IrO2, V2O3, TiO2, among others, doped with impurities such as magnetic Co and Ni. It is intended to realize the interaction processes in these materials which lead to the formation of ferromagnetic order, in particular magnetism which is observed due to the introduction of structural defects in the samples. (AU)

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Scientific publications (11)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
PAES, V. Z. C.; VARALDA, J.; SCHIO, P.; MATSUSHIMA, J. T.; PEREIRA, E. C.; DE OLIVEIRA, A. J. A.; MOSCA, D. H.. Monte Carlo simulations of magnetization state of ellipsoidal CoCu particles in disordered self-assembled arrays. Journal of Materials Research, v. 31, n. 14, p. 2058-2064, . (12/24025-0, 13/07296-2)
VON DREIFUS, DRIELE; PEREIRA, ERNESTO CHAVES; APARECIDO DE OLIVEIRA, ADILSON JESUS. Observation of superficial antiferromagnetism in Co3O4 polycrystals. MATERIALS RESEARCH EXPRESS, v. 2, n. 11, . (13/07296-2, 12/24025-0, 09/54082-2)
DREIFUS, D.; GODOY, M. P. F.; RABELO, A. C.; RODRIGUES, A. D.; GOBATO, Y. G.; CAMARGO, P. C.; PEREIRA, E. C.; DE OLIVEIRA, A. J. A.. Antiferromagnetism induced by oxygen vacancies in V2O5 polycrystals synthesized by the Pechini method. JOURNAL OF PHYSICS D-APPLIED PHYSICS, v. 48, n. 44, . (13/17657-2, 12/24025-0, 13/07296-2)
ZABOTTO, F. L.; GUALDI, A. J.; DE CAMARGO, P. C.; DE OLIVEIRA, A. J. A.; EIRAS, J. A.; GARCIA, D.. Grain coarsening and its effects on the properties of magnetoelectric 0.675(Pb(Mg1/3Nb2/3)O-3)-0.325PbTiO(2)/CoFe2O4 particulate composites. Journal of Alloys and Compounds, v. 676, p. 80-85, . (12/24025-0, 08/04025-0, 10/07518-7)
HERVAL, LEONILSON K. S.; VON DREIFUS, DRIELE; RABELO, ADRIANO C.; RODRIGUES, ARIANO D.; PEREIRA, ERNESTO C.; GOBATO, YARA G.; DE OLIVEIRA, ADILSON J. A.; DE GODOY, MARCIO P. F.. The role of defects on the structural and magnetic properties of Nb2O5. Journal of Alloys and Compounds, v. 653, p. 358-362, . (12/24025-0, 13/17657-2)
J. R. MUÑOZ HOYOS; E. R. BOTERO; D. GARCIA; R. H. G. A. KIMINAMI. Síntese in situ pelo método Pechini para obtenção do compósito SBN61/NFO sem crescimento anormal de grão. Cerâmica, v. 63, n. 368, p. 478-484, . (08/04025-0, 12/24025-0)
SCHIO, P.; BARTUREN, M.; MILANO, J.; BONILLA, F. J.; ZHENG, Y.; VIDAL, F.; DE OLIVEIRA, A. J. A.. Magnetic anisotropy of 3nm diameter Co nanowires embedded in CeO2/SrTiO3(001): a ferromagnetic resonance study. MATERIALS RESEARCH EXPRESS, v. 1, n. 3, . (07/08649-5, 12/24025-0)
GUALDI, A. J.; ZABOTTO, F. L.; GARCIA, D.; BHALLA, A.; GUO, R.; DE CAMARGO, P. C.; DE OLIVEIRA, A. J. A.. Understanding the dynamic magnetization process for the magnetoelectric effect in multiferroic composites. Journal of Applied Physics, v. 119, n. 12, . (10/00040-4, 12/24025-0, 10/07518-7)
W. S. CASTRO; L. J. D. COSTA; R. R. CORRÊA; A. J. A. DE OLIVEIRA; R. H. G. A. KIMINAMI. Microestrutura e propriedades magnéticas da hexaferrita de bário dopada com cromo e sinterizada por micro-ondas. Cerâmica, v. 60, n. 356, p. 563-568, . (08/04025-0, 12/24025-0)
W. S. CASTRO; R. R. CORRÊA; A. J. A. DE OLIVEIRA; R. H. G. A. KIMINAMI. Síntese por reação por combustão de nanopós de hexaferrita de estrôncio dopada com cromo. Cerâmica, v. 60, n. 354, p. 254-258, . (08/04025-0, 12/24025-0)
GUALDI, A. J.; ZABOTTO, F. L.; GARCIA, D.; DE OLIVEIRA, A. J. A.. Stress magnetization model for magnetostriction in multiferroic composite. Journal of Applied Physics, v. 114, n. 5, . (10/00040-4, 12/24025-0)

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