Giant anisotropy of magnetic damping and significant in-plane uniaxial magnetic anisotropy in amorphous Co40Fe40B20 films on GaAs(001)

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

作者机构：National Laboratory of Solid State Microstructures and Department of PhysicsNanjing UniversityNanjing 210093China Department of Mathematics and PhysicsNanjing Institute of TechnologyNanjing 211167China Department of Physics and Jiangsu Key Laboratory of Advanced Metallic MaterialsSoutheast UniversityNanjing 211189China Key Laboratory of Spintronics MaterialsDevices and Systems of Zhejiang ProvinceHangzhou 311300China Department of Electronic EngineeringNanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced MicrostructuresNanjing 210093China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2020年第29卷第10期

页      面：488-493页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

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) 

主　　题：magnetic damping uniaxial magnetic anisotropy ferromagnetic resonance two-magnon scattering 

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.