Journal of East China Normal University(Natural Science) ›› 2022, Vol. 2022 ›› Issue (2): 120-126.doi: 10.3969/j.issn.1000-5641.2022.02.014

• Physics and Electronics • Previous Articles     Next Articles

Study of polarized laser-induced ultrafast spin dynamics on [Pt/Co]3MnIr film

Wenqi ZHENG1, Yu LIU2, Hailin HU1, Shitao LOU1,*()   

  1. 1. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai　200241, China
    2. Department of Optical Science and Engineering, School of Information Science and Technology, Fudan University, Shanghai　200433, China
  • Received:2021-04-09 Online:2022-03-25 Published:2022-03-28
  • Contact: Shitao LOU E-mail:stlou@admin.ecnu.edu.cn

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Abstract:

In this study, ultrafast spin dynamics on FM-AFM (ferromagnetism-antiferromagnetism) thin film were explored using pump-probe technology with circularly polarized and linear pump beams. Circularly polarized light generates an effective inducting magnetic field, which is called the inverse Faraday effect. The direction of the transient Kerr peak only depends on the angular momentum of photons. The amplitude of the Kerr peak depends on the thickness of the MnIr film. This may be attributed to the fact that the transient Kerr peak originates from the magnetization of paramagnetic electrons. This study may help further the understanding of spin dynamics in HD-AOS (Helicity-Dependent All Optical Switching).

Key words: [Pt/Co]3MnIr thin film, polarized light induced ultrafast spin dynamics, angular momentum

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