Photoinduced Dynamics of Sublattice Magnetization in Ferrimagnets : FeCr_2S_4 and CoCr_2S_4

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Abstract

The photoinduced dynamics of sublattice magnetization in ferrimagnetic compounds, FeCr<SUB>2</SUB>S<SUB>4</SUB> and CoCr<SUB>2</SUB>S<SUB>4</SUB>, was investigated by time-resolved magneto-optical Kerr spectroscopy probing element-specific optical transitions. In FeCr<SUB>2</SUB>S<SUB>4</SUB>, the non-collinear dynamics of the sublattice magnetizations was observed. Upon irradiation of a 200 fs laser pulse, the Cr sublattice magnetization starts to precess, whereas the Fe sublattice magnetization starts to decrease without precession. In CoCr<SUB>2</SUB>S<SUB>4</SUB>, by contrast, Co and Cr sublattice moments show the same precession, retaining the collinear relation after photoexcitation. The versatile collinear/noncollinear spin dynamics can be accounted for in terms of the relative magnitude of the magnetocrystalline anisotropy at the Fe/Co site to the exchange interaction between Cr and Fe/Co spins.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 75(8), "83707-1"-"83707-4", 2006-08-15

    The Physical Society of Japan (JPS)

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Codes

  • NII Article ID (NAID)
    110004799194
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    SHO
  • ISSN
    00319015
  • NDL Article ID
    8019775
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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