Possible misleading interpretations on magnetic and transport properties in BiFeO3 nanoparticles caused by impurity phase

Autor(es)

Ramirez, Fabian E. N. ^[1] ; Pasca, Gabriel A. C. ^[1] ; Souza, Jose A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, BR-09090400 Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physics Letters A; v. 379, n. 24-25, p. 1549-1553, JUL 31 2015.
• Citações Web of Science: 12

Resumo

BiFeO3 nanoparticles were synthesized by a wet chemical method. X-ray powder diffraction indicated single phase samples. The sample Si shows a ferromagnetic-like behavior whereas S2 exhibits an antiferromagnetic-like character with lower magnetic moment and coercive field. Magnetic measurements at high temperature reveal two phase transitions, one related to BiFeO3 and another from alpha-Fe2O3 magnetic impurity in contrast to X-ray diffraction. We observed an increase of remanent polarization, coercive electrical field, and the appearance of interfacial polarization due to higher leakage current density. We discuss how an apparently single phase sample can lead to misleading interpretations in magnetic and dielectric properties. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 10/18364-0 - Estudo das Propriedades Físicas e Fenômeno Crítico em Sistemas Fortemente Correlacionados.
• Beneficiário: Fabian Enrique Nima Ramirez
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/16172-5 - Síntese e caracterização das propriedades físicas de materiais nanoestruturados
• Beneficiário: José Antonio Souza
• Modalidade de apoio: Auxílio à Pesquisa - Regular