Measurement of the energy barrier distribution in the antiferromagnetic layer of exchange-biased materials

被引：6

作者：

O'Grady, K ^{[1
]}

Holloway, L ^{[1
]}

Antel, WJ ^{[1
]}

机构：

[1] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2002年 / 38卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

exchange bias; exchange interactions;

D O I：

10.1109/TMAG.2002.802867

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The value of exchange field of two FeMn-NiFeCo-based spin valves with varying thickness of the pinned ferromagnetic layer has been determined as a function of temperature. The complexities caused by thermal activation of the antiferromagnet during measurement have been overcome by the development of a measurement protocol. The values of the exchange field obtained provide a measure of the degree of order in the antiferromagnet. Thus it is possible to determine the distribution of energy barriers to reversal for the system. We find that for a 110-Angstrom-thick pinned NiFeCo layer a broad distribution exists, whereas for an 80-Angstrom layer, the distribution is bimodal and has a component subject to thermal activation at temperatures down to 260 K.

引用

页码：2741 / 2743

页数：3

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