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Type: Artigo de periódico
Title: Temperature dependence of coercive field of ZnFe2O4 nanoparticles
Author: Mendonca, EC
Jesus, CBR
Folly, WSD
Meneses, CT
Duque, JGS
Coelho, AA
Abstract: Structural and magnetic measurements on ZnFe2O4 nanoparticles obtained through co-precipitation chemical method are reported. The Rietveld analysis of X-ray patterns reveal that (i) our samples are single phase, and (ii) the average particle size increases with synthesis temperature. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization measurements show that the average blocking temperature increases for increasing mean particle size. Besides, one can observe via magnetization measurements that our particle size distribution also increases as a function of synthesis temperature. Finally, we have observed that the coercive field does not decay with the square root of temperature following the Neel relaxation and the Bean-Livingston approaches. In order to fit our experimental data, we have used a generalized model that proposes a temperature dependence of blocking temperature due to the coexistence of blocked and unblocked particles. This proposed generalized model shows good agreement with our experimental results. (C) 2012 American Institute of Physics. []
Country: EUA
Editor: Amer Inst Physics
Citation: Journal Of Applied Physics. Amer Inst Physics, v. 111, n. 5, 2012.
Rights: aberto
Identifier DOI: 10.1063/1.3691792
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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