摘要
Tuning magnetic damping constant in dedicated spintronic devices has important scientific and technological implications. Here we report on anisotropic damping in various compositional amorphous CoFeB films grown on GaAs(001) substrates. Measured by a vector network analyzer-ferromagnetic resonance (VNA-FMR) equipment, a giant magnetic damping anisotropy of 385%, i.e., the damping constant increases by about four times, is observed in a 10-nm-thick Co40Fe40B20 film when its magnetization rotates from easy axis to hard axis, accompanied by a large and pure in-plane uniaxial magnetic anisotropy (UMA) with its anisotropic field of about 450 Oe. The distinct damping anisotropy is mainly resulted from anisotropic two-magnon-scattering induced by the interface between the ferromagnetic layer and the substrate, which also generates a significant UMA in the film plane.
作者
Ji Wang
Hong-Qing Tu
Jian Liang
Ya Zhai
Ruo-Bai Liu
Yuan Yuan
Lin-Ao Huang
Tian-Yu Liu
Bo Liu
Hao Meng
Biao You
Wei Zhang
Yong-Bing Xu
Jun Du
王佶;涂宏庆;梁健;翟亚;刘若柏;袁源;黄林傲;刘天宇;刘波;孟皓;游彪;张维;徐永兵;杜军(National Laboratory of Solid State Microstructures and Department of Physics,Nanjing University,Nanjing 210093,China;Department of Mathematics and Physics,Nanjing Institute of Technology,Nanjing 211167,China;Department of Physics and Jiangsu Key Laboratory of Advanced Metallic Materials,Southeast University,Nanjing 211189,China;Key Laboratory of Spintronics Materials,Devices and Systems of Zhejiang Province,Hangzhou 311300,China;Department of Electronic Engineering,Nanjing University,Nanjing 210093,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China)
基金
Project supported by the National Key Research and Development Program of China(Grant No.2016YFA0300803)
the National Natural Science Foundation of China(Grant Nos.51971109,51771053,and 51471085)
Scientific Research Foundation of Nanjing Institute of Technology(Grant Nos.ZKJ201708 and CKJB201708).
