Dynamical study of remanent magnetization in nanoparticles

被引：0

作者：

Grinstein, G ^{[1
]}

Held, GA ^{[1
]}

Koch, RH ^{[1
]}

机构：

[1] IBM Corp, Thomas J Watson Res Ctr, Yorktown Hts, NY 10598 USA

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2001年 / 237卷 / 01期

关键词：

magnetic nanoparticles; spin models; remanent magnetization; spin dynamics; Landau-Lifshitz equation;

D O I：

10.1016/S0304-8853(01)00492-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

For collections of noninteracting nanoparticles, we study the reduced static remanent magnetization, MR, produced by the removal of a saturating magnetic field. We show that. except for special cases such as easy uniaxial anisotropy, MR depends on both the ramp-down rate of the field and the energy dissipation rate of the spin dynamics. Using the Landau-Lifshitz equation, we illustrate this result with explicit dynamical calculations Of MR for cubic and for mixed cubic-uniaxial anisotropies. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：90 / 96

页数：7

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