Photoinduced dynamics of sublattice magnetization in ferrimagnets: FeCr2S4 and CoCr2S4

Takeshi Ogasawara, Kenya Ohgushi, Hiroshi Okamoto, Yoshinori Tokura

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6 Citations (Scopus)


The photoinduced dynamics of sublattice magnetization in ferrimagnetic compounds, FeCr2S4 and CoCr2S4, was investigated by time-resolved magneto-optical Kerr spectroscopy probing element-specific optical transitions. In FeCr2S4, 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 CoCr2S4, 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.

Original languageEnglish
Article number083707
JournalJournal of the Physical Society of Japan
Issue number8
Publication statusPublished - 2006 Aug


  • Ferrimagnet
  • Magneto-optical effect
  • Photoinduced phenomena
  • Spin dynamics


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