Thickness dependence study of current-driven ferromagnetic resonance in Y3Fe5O12/heavy metal bilayers
Thickness dependence study of current-driven ferromagnetic resonance in Y3Fe5O12/heavy metal bilayers
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DOI：
10.1063/1.4977490
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发表时间：
2016-12
影响因子：
4
通讯作者：
Z. Fang;A. Mitra;A. Westerman;Mannan Ali;C. Ciccarelli;O. Cespedes;B. Hickey;A. Ferguson
中科院分区：
文献类型：
--
作者：
Z. Fang;A. Mitra;A. Westerman;Mannan Ali;C. Ciccarelli;O. Cespedes;B. Hickey;A. Ferguson
我们利用铁磁共振技术研究了YIG/重金属双层膜中的电流感应力矩。YIG样品的厚度从14.8 nm到80 nm不等，顶部的Pt或Ta薄膜，测量通过施加微波电流到重金属和测量的纵向直流电压产生的自旋整流和自旋泵。从对称性分析的FMR线型和YIG厚度的依赖关系，我们推断，奥斯特场占主导地位的自旋转移力矩驱动磁化动力学。
We use ferromagnetic resonance to study the current-induced torques in YIG/heavy metal bilayers. YIG samples with thickness varying from 14.8 nm to 80 nm, with the Pt or Ta thin film on top, are measured by applying a microwave current into the heavy metals and measuring the longitudinal DC voltage generated by both spin rectification and spin pumping. From a symmetry analysis of the FMR lineshape and its dependence on YIG thickness, we deduce that the Oersted field dominates over spin-transfer torque in driving magnetization dynamics.