TY - JOUR
T1 - Photoinduced dynamics of sublattice magnetization in ferrimagnets
T2 - FeCr2S4 and CoCr2S4
AU - Ogasawara, Takeshi
AU - Ohgushi, Kenya
AU - Okamoto, Hiroshi
AU - Tokura, Yoshinori
PY - 2006/8
Y1 - 2006/8
N2 - 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.
AB - 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.
KW - Ferrimagnet
KW - Magneto-optical effect
KW - Photoinduced phenomena
KW - Spin dynamics
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U2 - 10.1143/JPSJ.75.083707
DO - 10.1143/JPSJ.75.083707
M3 - Article
AN - SCOPUS:33847408506
SN - 0031-9015
VL - 75
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 8
M1 - 083707
ER -