General features of photoinduced spin dynamics in ferromagnetic and ferrimagnetic compounds

被引：54
作者：
Ogasawara, T [1 ]
Ohgushi, K
Tomioka, Y
Takahashi, KS
Okamoto, H
Kawasaki, M
Tokura, Y
机构：
[1] Natl Inst Adv Ind Sci & Technol, CERC, Tsukuba, Ibaraki 3058562, Japan
[2] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
[3] Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba 2778561, Japan
[4] Tohoku Univ, Mat Res Inst, Sendai, Miyagi 9808577, Japan
[5] Japan Sci & Technol Corp JST, ERATO, SSS, Tsukuba, Ibaraki 3050046, Japan
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 08期
关键词：
D O I：
10.1103/PhysRevLett.087202
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页数：4
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