Ferromagnetic resonance in nanoscale CoFeB/MgO magnetic tunnel junctions

Ferromagnetic resonance in nanoscale CoFeB/MgO magnetic tunnel junctions
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DOI：
10.1063/1.4908149
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发表时间：
2015-02
期刊：
Journal of Applied Physics
影响因子：
3.2
通讯作者：
Eriko Hirayama;S. Kanai;Hiroki Sato;F. Matsukura;H. Ohno
Eriko Hirayama;S. Kanai;Hiroki Sato;F. Matsukura;H. Ohno
中科院分区：
物理与天体物理3区
文献类型：
--
作者：
Eriko Hirayama;S. Kanai;Hiroki Sato;F. Matsukura;H. Ohno

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用零差探测铁磁共振研究了CoFeB/MgO磁性隧道结(MTJ)中无CoFeB层的结尺寸与磁性的关系，其中圆形MTJ的直径从35 nm变化到100 nm。我们观察到自由层的有效垂直磁各向异性场和表观阻尼常数随直径减小而增大。
We investigate the junction size dependence of magnetic properties of a CoFeB free layer in CoFeB/MgO magnetic tunnel junctions (MTJs) by homodyne-detected ferromagnetic resonance, where the diameter of the circular MTJs is varied from 35 nm to 100 nm. We observe the increase of the effective perpendicular magnetic anisotropy field and the apparent damping constant in the free layers with decreasing diameter.