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Phys. Rev. Lett. 94, 087202 (2005) [4 pages]

General Features of Photoinduced Spin Dynamics in Ferromagnetic and Ferrimagnetic Compounds

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T. Ogasawara1, K. Ohgushi2, Y. Tomioka1, K. S. Takahashi2, H. Okamoto1,3, M. Kawasaki1,4, and Y. Tokura1,2,5
1Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan
2Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
3Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan
4Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
5Spin Superstructure Project (SSS), ERATO, Japan Science and Technology Corporation (JST), Tsukuba 305-0046, Japan

Received 18 May 2004; published 3 March 2005

Ultrafast photoinduced spin dynamics has been investigated by time-resolved magneto-optical Kerr spectroscopy for various ferromagnetic and ferrimagnetic compounds: FeCr2S4, CoCr2S4, CuCr2Se4, CdCr2Se4, La0.6Sr0.4MnO3, and SrRuO3. The temporal demagnetization process, which is observed commonly for all the compounds, essentially consists of two components: One is an instantaneous change which originates perhaps from multiple emissions of magnetic excitations during nonradiative decay of photoexcited carriers, and the other is a delayed response due to thermalization of the spin system. The time constant of the delayed change depends strongly on materials and is scaled with the magnetocrystalline anisotropy, indicating that spin-orbit coupling is a dominant interaction for this process.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.087202
DOI:
10.1103/PhysRevLett.94.087202
PACS:
75.40.Gb, 78.20.Ls, 78.47.+p
 
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