The asymmetric magnetization reversal in exchange biased granular Co/CoO films

被引：18

作者：

Wu, R. ^{[1
]}

Wei, J. Z. ^{[1
]}

Peng, X. L. ^{[1
]}

Fu, J. B. ^{[1
]}

Liu, S. Q. ^{[1
]}

Zhang, Y. ^{[1
]}

Xia, Y. H. ^{[1
]}

Wang, C. S. ^{[1
]}

Yang, Y. C. ^{[1
]}

Yang, J. B. ^{[1
,2
]}

机构：

[1] Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China

[2] Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 18期

基金：

国家高技术研究发展计划(863计划); 中国国家自然科学基金;

关键词：

D O I：

10.1063/1.4875594

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A special kind of asymmetric magnetization reversal characterized by a sharp step in the second quadrant of the hysteresis loop has been investigated in the exchange biased Co/CoO films. This asymmetry only exists in the film where the small clusters grow to form islands. A bimodal distribution of the first-order reversal curves diagram demonstrates that the irreversible magnetization reversal is composed of the free part and exchange biased part, originating from the grains smaller and larger than 6 nm in the film, respectively. The finite-size effect of the antiferromagnetic anisotropy in the ultrafine grains is responsible for this asymmetry. (C) 2014 AIP Publishing LLC.

引用

页数：4

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