Investigation of perpendicular magnetic anisotropy of CoFeB by x-ray magnetic circular dichroism

被引：26
|
作者：
Tsai, W. C. [1 ]
Liao, S. C. [1 ]
Hou, H. C. [1 ]
Yen, C. T. [2 ]
Wang, Y. H. [2 ]
Tsai, H. M. [3 ]
Chang, F. H. [3 ]
Lin, H. J. [3 ]
Lai, Chih-Huang [1 ]
机构：
[1] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 30013, Taiwan
[2] Ind Technol Res Inst, Elect & Optoelect Res Lab, Hsinchu 31040, Taiwan
[3] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan
来源：
APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 17期
关键词：
TUNNEL-JUNCTION; ORBITAL-MOMENT; FILMS; IRON;
D O I：
10.1063/1.4707380
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have studied the variation of perpendicular magnetic anisotropy (PMA) of CoFeB layers with the oxidation degree of the MgO buffer layers. After annealing at 330 degrees C, the out-of-plane anisotropy field (H-k) of 1.5-nm CoFeB could be optimized to 3.1 kOe. To investigate the orbital hybridization of the Fe-3d and O-2p, the orbital moments per hole (m(orb)/N-h) of Fe in annealed CoFeB layers were extracted by using x-ray magnetic circular dichroism. The dependence of m(orb)/N-h on the oxidation time of MgO coincided with that of H-k, which revealed that PMA of annealed CoFeB originated from the interfacial orbital hybridization. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4707380]
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页数：4
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