Effect of the surface anisotropy and the shape on the magnetization behavior in an egg-shaped nanoparticle

被引：5

作者：

Du, An ^{[1
]}

Xu, Yuanyuan ^{[1
]}

机构：

[1] Northeastern Univ, Coll Sci, Shenyang 110004, Peoples R China

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 21期

关键词：

ferromagnetic nanoparticle; surface anisotropy; Monte Carlo simulation; exchange bias;

D O I：

10.1016/j.jmmm.2008.03.057

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using the classical Heisenberg model and Monte Carlo simulation, we compute the magnetization behavior of a ferromagnetic nanoparticle with an egg-shape in an external magnetic field along the symmetry axis. The particle is in a single-domain state with a surface anisotropy axis perpendicular to the surface of the particle. At low temperature, it is found that exchange bias appears in the hysteresis loop, which does not exist in the spherical and ellipsoidal nanoparticles. The bias field produced by the frozen spins on the surface of the egg-shaped nanoparticle may be the reason to produce the phenomenon of the exchange bias. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：2567 / 2570

页数：4

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