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Synthesis and characterization of physical properties of nanosized materials

Abstract

A considerable effort has been put forward in order to grow magnetoelectric nanostructured materials. Besides fundamental science, they are very attractive in the electronic industry as well as magnetic storage media, solar energy conversion due to their nanometer scale. Semiconducting properties along with ferromagnetic order functionality have been the focus in the area of spintronics. It is believed that all metal oxides in nanostructured forms would exhibit ferromagnetic order at room temperature which disappears in bulk samples. The general understanding is that the origin of ferromagnetism in these materials is the magnetic exchange interactions between localized electron spin moments resulting from uncompensated charges, intrinsic defects, cation or anion vacancies at the surfaces of the nanostructures. However, systematic studies on the origin of ferromagnetism are lacking. Within is context, we intend to study the physical properties of transition metal oxides and conventional multiferroic system in nanosized scale focusing on the origin of ferromagnetism and ferroelectricity. (AU)

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Scientific publications (9)
(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)
RAMIREZ, FABIAN E. N.; PASCA, GABRIEL A. C.; SOUZA, JOSE A.. Possible misleading interpretations on magnetic and transport properties in BiFeO3 nanoparticles caused by impurity phase. Physics Letters A, v. 379, n. 24-25, p. 1549-1553, . (10/18364-0, 13/16172-5)
RIVALDO-GOMEZ, C. M.; CABRERA-PASCA, G. A.; ZUNIGA, A.; CARBONARI, A. W.; SOUZA, J. A.. Hierarchically structured nanowires on and nanosticks in ZnO microtubes. SCIENTIFIC REPORTS, v. 5, . (13/16172-5)
RAMIREZ, F. E. N.; CABRERA-PASCA, G. A.; MESTNIK-FILHO, J.; CARBONARI, A. W.; SOUZA, J. A.. Magnetic and transport properties assisted by local distortions in Bi2Mn4O10 and Bi2Fe4O9 multiferroic compounds. Journal of Alloys and Compounds, v. 651, p. 405-413, . (13/16172-5)
SOUZA, J. A.; CRIADO, D.; ZUNIGA, A.; MIRANDA, V. N.; RAMIREZ, F. E. N.; MASUNAGA, S. H.; JARDIM, R. F.. Enhanced ferromagnetism in CuO nanowires on the top of CuO nanograins. Journal of Applied Physics, v. 114, n. 17, . (09/18618-5, 10/18364-0, 13/16172-5)
DIAZ POMAR, C.; MARTINHO, H.; FERREIRA, F. F.; GOIA, T. S.; RODAS, A. C. D.; SANTOS, S. F.; SOUZA, J. A.. Synthesis of magnetic microtubes decorated with nanowires and cells. AIP ADVANCES, v. 8, n. 4, . (16/09769-3, 11/19924-2, 13/16172-5)
SOMBRIO, GUILHERME; RIVALDO-GOMEZ, C. M.; POMAR, CESAR A. D.; SOUZA, JOSE A.. Lattice diffusion and vapor solid growths forming nanoarchitectures on ZnO nanowires. SUPERLATTICES AND MICROSTRUCTURES, v. 112, p. 180-185, . (16/09769-3, 13/16172-5)
RAMIREZ, F. E. N.; ESPINOSA, E. E.; PEDROZA, LUANA S.; SOUZA, J. A.. Humidity sensing effect in Bi25FeO39 sillenite-like compound. Journal of Materials Science, v. 51, n. 24, p. 10982-10989, . (16/09769-3, 10/18364-0, 13/16172-5)
RIVALDO-GOMEZ, C. M.; ZUNIGA, A.; CRIADO, D.; SCHOENMAKER, J.; SOUZA, J. A.. Microtubes decorated with nanowires. Applied Physics Letters, v. 106, n. 21, . (09/18618-5, 13/16172-5)
RIVALDO-GOMEZ, C. M.; FERREIRA, F. F.; LANDI, G. T.; SOUZA, J. A.. New route for hollow materials. SCIENTIFIC REPORTS, v. 6, . (13/16172-5, 16/09769-3, 15/10900-4, 14/01218-2)

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Filed patent(s) as a result of this research project

MÉTODO PARA OBTENÇÃO DE MICROTUBOS DE ÓXIDO DE ZINCO - ZNO - COM COBERTURA DE NANOFIOS EM SUA SUPERFÍCIE EXTERNA E PRODUTO RESULTANTE BR1020140191259 - Universidade Federal do ABC (UFABC) . José Antonio Souza ; Cynthia Marina Rivaldo Gómez - August 2014, 01

ELEMENTO SENSORIAL DE UMIDADE BR1020150289456 - Universidade Federal do ABC (UFABC) . José Antonio Souza ; Emersson Eduardo Espinoza Velez ; Marcia Tsuyama Escote ; Marcio Sena Curvello - November 2015, 18