中国物理B ›› 2020, Vol. 29 ›› Issue (10): 107503-.doi: 10.1088/1674-1056/abad1d

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Ji Wang(王佶)1, Hong-Qing Tu(涂宏庆)1,2, Jian Liang(梁健)3, Ya Zhai(翟亚)3, Ruo-Bai Liu(刘若柏)1, Yuan Yuan(袁源)1, Lin-Ao Huang(黄林傲)1, Tian-Yu Liu(刘天宇)1, Bo Liu(刘波)4,†(), Hao Meng(孟皓)4, Biao You(游彪)1,6, Wei Zhang(张维)1,6, Yong-Bing Xu(徐永兵)5, Jun Du(杜军)1,6,‡()   

  • 收稿日期:2020-07-05 修回日期:2020-07-31 接受日期:2020-08-07 出版日期:2020-10-05 发布日期:2020-10-05
  • 通讯作者: Bo Liu(刘波), Jun Du(杜军)

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

Ji Wang(王佶)1, Hong-Qing Tu(涂宏庆)1,2, Jian Liang(梁健)3, Ya Zhai(翟亚)3, Ruo-Bai Liu(刘若柏)1, Yuan Yuan(袁源)1, Lin-Ao Huang(黄林傲)1, Tian-Yu Liu(刘天宇)1, Bo Liu(刘波)4,†, Hao Meng(孟皓)4, Biao You(游彪)1,6, Wei Zhang(张维)1,6, Yong-Bing Xu(徐永兵)5, and Jun Du(杜军)1,6,‡   

  1. 1 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
    2 Department of Mathematics and Physics, Nanjing Institute of Technology, Nanjing 211167, China
    3 Department of Physics and Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing 211189, China
    4 Key Laboratory of Spintronics Materials, Devices and Systems of Zhejiang Province, Hangzhou 311300, China
    5 Department of Electronic Engineering, Nanjing University, Nanjing 210093, China
    6 Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
  • Received:2020-07-05 Revised:2020-07-31 Accepted:2020-08-07 Online:2020-10-05 Published:2020-10-05
  • Contact: Corresponding author. E-mail: liubo@hikstor.com Corresponding author. E-mail: jdu@nju.edu.cn
  • About author:
    †Corresponding author. E-mail: liubo@hikstor.com
    ‡Corresponding author. E-mail: jdu@nju.edu.cn
    * 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), and Scientific Research Foundation of Nanjing Institute of Technology (Grant Nos. ZKJ201708 and CKJB201708).

Abstract:

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.

Key words: magnetic damping, uniaxial magnetic anisotropy, ferromagnetic resonance, two-magnon scattering

中图分类号:  (Magnetization dynamics)

  • 75.78.-n
75.30.Gw (Magnetic anisotropy) 76.50.+g (Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)