中国物理B ›› 2019, Vol. 28 ›› Issue (9): 97502-097502.doi: 10.1088/1674-1056/ab38ad

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

The unique magnetic damping enhancement in epitaxial Co2Fe1-xMnxAl films

Shu-Fa Li(李树发), Chu-Yuan Cheng(程樗元), Kang-Kang Meng(孟康康), Chun-Lei Chen(陈春雷)   

  1. 1 College of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang 524000, China;
    2 State-Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China;
    3 State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
  • 收稿日期:2019-06-12 修回日期:2019-07-24 出版日期:2019-09-05 发布日期:2019-09-05
  • 通讯作者: Shu-Fa Li E-mail:lishufa310@163.com
  • 基金资助:

    Project supported by the Natural Science Foundation of Guangdong Province, China (Grant No. 2015A030310003) and the Program for Scientific Research Start-up Funds of Guangdong Ocean University, China.

The unique magnetic damping enhancement in epitaxial Co2Fe1-xMnxAl films

Shu-Fa Li(李树发)1,2, Chu-Yuan Cheng(程樗元)2, Kang-Kang Meng(孟康康)3, Chun-Lei Chen(陈春雷)1   

  1. 1 College of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang 524000, China;
    2 State-Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China;
    3 State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
  • Received:2019-06-12 Revised:2019-07-24 Online:2019-09-05 Published:2019-09-05
  • Contact: Shu-Fa Li E-mail:lishufa310@163.com
  • Supported by:

    Project supported by the Natural Science Foundation of Guangdong Province, China (Grant No. 2015A030310003) and the Program for Scientific Research Start-up Funds of Guangdong Ocean University, China.

摘要:

Uniform precession dynamics and its magnetic damping are investigated in epitaxial Co2Fe1-xMnxAl films by using the time-resolved magneto-optical Kerr effect under out-of-plane configuration. The decay time of uniform precession mode decreases, and thus the magnetic damping increases with the increase of external field. Moreover, the decay time decreases as x decreases, so that the enhancement of magnetic damping occurs in Fe-rich sample. Furthermore, the decay time decreases as the excitation fluence increases, which drops rapidly at low magnetic field comparing with the slow reduction at high magnetic field. This unique magnetic damping enhancement is attributed to the enhancement of homogeneous magnetization.

关键词: ultrafast dynamics, pump-probe, magnetic damping, Heusler alloy

Abstract:

Uniform precession dynamics and its magnetic damping are investigated in epitaxial Co2Fe1-xMnxAl films by using the time-resolved magneto-optical Kerr effect under out-of-plane configuration. The decay time of uniform precession mode decreases, and thus the magnetic damping increases with the increase of external field. Moreover, the decay time decreases as x decreases, so that the enhancement of magnetic damping occurs in Fe-rich sample. Furthermore, the decay time decreases as the excitation fluence increases, which drops rapidly at low magnetic field comparing with the slow reduction at high magnetic field. This unique magnetic damping enhancement is attributed to the enhancement of homogeneous magnetization.

Key words: ultrafast dynamics, pump-probe, magnetic damping, Heusler alloy

中图分类号:  (Dynamic properties?)

  • 75.40.Gb
76.50.+g (Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance) 78.20.Ls (Magneto-optical effects)