Photoinduced dynamics of sublattice magnetization in ferrimagnets:: FeCr2S4 and CoCr2S4

被引：6

作者：

Ogasawara, Takeshi ^{[1
]}

Ohgushi, Kenya

Okamoto, Hiroshi

Tokura, Yoshinori

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] Japan Sci & Technol Corp, ERATO, Spin Superstruct Project, Tsukuba, Ibaraki 3050046, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2006年 / 75卷 / 08期

关键词：

spin dynamics; photoinduced phenomena; ferrimagnet; magneto-optical effect;

D O I：

10.1143/JPSJ.75.083707

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 200fs 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.

引用

页数：4

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