Thickness dependence of exchange anisotropy for (001) oriented Mn89Pt11/NiFe and Mn80Ir20/NiFe bilayers

被引：0
|
作者：
Kume, T.
Yamato, T.
Kato, T.
Tsunashima, S.
Iwata, S.
机构：
[1] Nagoya Univ, Dept Elect, Chikusa Ku, Nagoya, Aichi 4648603, Japan
[2] Nagoya Univ, CCRAST, Chikusa Ku, Nagoya, Aichi 4648603, Japan
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 310卷 / 02期
关键词：
exchange anisotropy; epitaxial film; MnPt alloy; MnIr alloy; thickness dependence;
D O I：
10.1016/j.jmmm.2006.10.794
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Antiferromagnetic layer thickness dependences of exchange anisotropy for ( 0 0 1) oriented Mn89Pt11 ( t(AF) nm)/ Ni80Fe20 ( 5 nm) and Mn80Ir20 ( tAF nm)/ Ni80Fe20 ( 5 nm) were investigated. For Mn89Pt11/ NiFe, the exchange bias field appeared at t(AF) >= 5 nm. This critical thickness was found to be thicker than that of Mn80Ir20/ NiFe ( tAF 3 nm). The thickness dependence of exchange bias field agreed well with that of 1- fold Fourier amplitude estimated from in- plane torque curves. The large coercivity of about 100 Oe was found for Mn89Pt11/ NiFe at t(AF) 30nm compared to that of Mn80Ir20/ NiFe. The large coercivity in Mn89Pt11/ NiFe bilayers seems to result from the large 4- fold anisotropy in their torque curve. (c) 2006 Elsevier B. V. All rights reserved.
引用
收藏
页码：2298 / 2300
页数：3
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