Exchange-bias and exchange-spring coupling in magnetic core-shell nanoparticles

被引：33

作者：

Soares, J. M. ^{[1
]}

Galdino, V. B. ^{[1
]}

Machado, F. L. A. ^{[2
]}

机构：

[1] Univ Estado Rio Grande do Norte, Dept Fis, BR-59610010 Mossoro, RN, Brazil

[2] Univ Fed Pernambuco, Dept Fis, BR-50670901 Recife, PE, Brazil

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2014年 / 350卷

关键词：

Cobalt ferrite; Core-shell; Nanoparticie; Exchange-spring; Exchange-bias; SIZE;

D O I：

10.1016/j.jmmm.2013.09.040

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanopowders of CoFe2O4 with an average particle size of 72.7 nm were produced by an oxidation process and they were used to obtain core-shell nanoparticles of CoFe2O4/CoFe2 by reducing them under hydrogen atmospheres. Hysteresis loops were measured from 10 to 300 K by field-cooling the sample under an applied magnetic held of 12 kOe. The exchange coupling among the core-shell structure was Found to vary with the thickness of the shell. A phenomenological model which takes into account the thickness of a disordered layer at the core-shell surface was used for determining the exchange-bias anisotropy constant K-EB ( = 0.22 erg/cm(2)). (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：69 / 72

页数：4

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