Effect of oxygen migration on magnetic anisotropy and damping constant in perpendicular Ta/CoFeB/Gd/MgO/Ta multilayers
Effect of oxygen migration on magnetic anisotropy and damping constant in perpendicular Ta/CoFeB/Gd/MgO/Ta multilayers
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氧迁移对垂直 Ta/CoFeB/Gd/MgO/Ta 多层膜磁各向异性和阻尼常数的影响
DOI：
10.1016/j.apsusc.2016.11.012
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发表时间：
2017-02
影响因子：
6.7
通讯作者：
G. H. Yu
中科院分区：
文献类型：
--
作者：
G. Yang;J. Y. Zhang;S. L. Jiang;B. W. Dong;S. G. Wang;J. L. Liu;Y. C. Zhao;W. Wang;Y. Sun;G. H. Yu
通过在垂直的Ta/CoFeb/Gd/MgO/Ta多层膜中插入一层具有强亲氧性的Gd层，研究了界面氧迁移对垂直磁各向异性(PMA)和阻尼常数的影响。通过在CoFeB/MgO界面处插入一层薄的Gd层，抑制了CoFeB的过氧化，导致界面处处于贫氧状态。在热退火过程中，没有Gd的样品和添加Gd的样品的氧迁移行为是不同的。通过优化Gd厚度，得到了面外和面内结构为0.6nmGd时的有效阻尼常数分别为0.029和0.037。这一数值比没有Gd层的分别降低了70%和46%。更重要的是，当Gd厚度增加到1.2 nm时，PMA可以很好地保持。这种基于氧迁移的磁性有效修饰为自旋电子学的应用提供了一条很有前途的途径。
By inserting a Gd layer with strong oxygen-affinitive property, the effect of interfacial oxygen migration on the perpendicular magnetic anisotropy (PMA) and damping constant was investigated in perpendicular Ta/CoFeB/Gd/MgO/Ta multilayers. The overoxidation of CoFeB was greatly suppressed by inserting a thin Gd layer at CoFeB/MgO interface, leading to an O-poor status at interface. Different oxygen migration behavior in samples without and with Gd was observed during the thermal annealing. By optimizing Gd thickness, the effective damping constant of 0.029 and 0.037 was obtained with 0.6 nm Gd layer in out-of-plane and in-plane configuration, respectively. This value was decreased by 70% and 46% with respect to that without Gd layer. More importantly, the PMA can be well maintained when Gd thickness was increased to 1.2 nm. This effective modification of magnetic properties based on oxygen migration provides a promising pathway for spintronic applications.
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