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J. Phys. Soc. Jpn. 75 (2006) 083707 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Photoinduced Dynamics of Sublattice Magnetization in Ferrimagnets: FeCr2S4 and CoCr2S4

Takeshi Ogasawara1, Kenya Ohgushi2, Hiroshi Okamoto1,3 and Yoshinori Tokura1,2,4

1Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562
2Department of Applied Physics, University of Tokyo, Tokyo 113-8656
3Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561
4Spin Superstructure Project (SSS), ERATO, Japan Science and Technology Corporation (JST), Tsukuba, Ibaraki 305-0046

(Received June 9, 2006; Accepted June 21, 2006; Published August 10, 2006)

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. ©2006 The Physical Society of Japan

KEYWORDS: spin dynamics, photoinduced phenomena, ferrimagnet, magneto-optical effect
URL: http://jpsj.ipap.jp/link?JPSJ/75/083707/
DOI: 10.1143/JPSJ.75.083707


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