Nonreciprocal behavior of the spin pumping in ultra-thin film of CoFeB

被引：8

作者：

Jamali, Mahdi ^{[1
]}

Smith, Angeline Klemm ^{[1
]}

Wang, Jian-Ping ^{[1
]}

机构：

[1] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2016年 / 119卷 / 13期

基金：

美国国家科学基金会;

关键词：

SURFACE;

D O I：

10.1063/1.4945028

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The processional magnetization induced spin current at the interface between CoFeB and Ta has been studied experimentally using spin pumping and inverse spin Hall effect for different thicknesses of CoFeB film down to 1.6 nm. It is found that upon decreasing the thickness of the CoFeB, the frequency of the peak position of the spin pumping signal reduces and dispersion relation of the ferromagnetic resonance changes from a quadratic to a linear behavior indicating the presence of an interfacial perpendicular anisotropy. Furthermore, a nonreciprocal behavior between the spin pumping signal amplitude at positive and negative fields is observed which could be as large as 100%. Our experimental results suggest reduction of the effective demagnetization field and possibly the spin waves nonreciprocal behavior mediated by the Dzyaloshinskii-Moriya interaction at the Ta/CoFeB interface are responsible for the large nonreciprocity of the spin pumping signal. (C) 2016 AIP Publishing LLC.

引用

页数：5