Photoinduced precession of magnetization in ferromagnetic (Ga,Mn)As

被引：99

作者：

Hashimoto, Y. ^{[1
]}

Kobayashi, S. ^{[1
]}

Munekata, H. ^{[1
]}

机构：

[1] Tokyo Inst Technol, Imaging Sci & Engn Lab, Midori Ku, Yokohama, Kanagawa 2268502, Japan

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 06期

关键词：

GA1-XMNXAS; ANISOTROPY; GAMNAS; MN;

D O I：

10.1103/PhysRevLett.100.067202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Precession of magnetization induced by pulsed optical excitation is observed in a ferromagnetic semiconductor (Ga,Mn)As by time-resolved magneto-optical measurements. It appears as complicated oscillations of a polarization plane of linearly polarized probe pulses, but is reproduced by gyromagnetic theory incorporating an impulsive change in an effective magnetic field due to a change in the magnetic anisotropy. The shape of the impulse suggests a significant nonthermal contribution of photogenerated carriers to the change in anisotropy through spin-orbit interaction.

引用

页数：4