The energy barriers in antiferromagnetically coupled media

被引：13

作者：

Margulies, DT ^{[1
]}

Berger, A ^{[1
]}

Moser, A ^{[1
]}

Schabes, ME ^{[1
]}

Fullerton, EE ^{[1
]}

机构：

[1] Hitachi Global Storage Technol, San Jose, CA 95120 USA

来源：

APPLIED PHYSICS LETTERS | 2003年 / 82卷 / 21期

关键词：

D O I：

10.1063/1.1578161

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We study the physics of the energy barriers for magnetization reversal in antiferromagnetically coupled (AFC) media by means of temperature dependent magnetometry as well as modeling. We find that the energy barrier of the lower layer is fairly low, and mainly given by its anisotropy volume product (KV). This means the lower layer magnetization is actually in thermal equilibrium, but the presence of the interlayer coupling makes the state with AF alignment of both layers thermodynamically so much more probable, that AFC media are thermally stable overall. The model further predicts that for typical values of the exchange coupling constant, the energy barrier of the composite system at zero field is essentially equal to the upper layer KV with the additional energy from the interlayer coupling being only a small perturbation. (C) 2003 American Institute of Physics.

引用

页码：3701 / 3703

页数：3

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