Reorientation of exchange anisotropy in epitaxial (002) IrMn/CoFe system

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作者：
Huang, Hsin-Hung [1 ]
Yang, Chih-Yen [1 ]
Lai, Chih-Huang [1 ]
机构：
[1] Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
来源：
Journal of Applied Physics | 2009年 / 105卷 / 07期
关键词：
We investigated the reorientation of exchange anisotropy in the epitaxial (002) IrMn/CoFe bilayers. Transitions of exchange-bias field from a negative field to a positive field with increasing time scale were observed at room temperature. The negatively magnetized state combining with the strong magnetocrystalline anisotropy of CoFe may raise the probability that the interfacial spins of thin IrMn layers were thermally relaxed to the direction of CoFe magnetization; therefore; after a period of time; the exchange-bias direction was reversed. This process can be further enhanced when samples were placed under the setting field. The double-shifted magnetization curve observed in this system was used as a good indicator for the relaxation of interfacial spins of IrMn. © 2009 American Institute of Physics;
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