Ultrafast dynamics of four-state magnetization reversal in (Ga,Mn)As

被引:9
|
作者
Zhu, Yonggang [1 ]
Zhang, Xinhui [1 ]
Li, Tao [1 ]
Huang, Xia [1 ]
Han, Lifen [1 ]
Zhao, Jianhua [1 ]
机构
[1] Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R China
基金
中国国家自然科学基金;
关键词
gallium arsenide; high-speed optical techniques; III-V semiconductors; Kerr magneto-optical effect; magnetic domain walls; magnetic switching; magnetic thin films; magnetisation reversal; manganese compounds; nucleation; optical pumping; semiconductor thin films; semimagnetic semiconductors; FERROMAGNETIC SEMICONDUCTOR;
D O I
10.1063/1.3202395
中图分类号
O59 [应用物理学];
学科分类号
摘要
The ultrafast dynamics of in-plane four-state magnetization reversal from compressively strained (Ga,Mn)As film was investigated by magneto-optical Kerr rotation measurement. The magnetization reversal signal was dramatically suppressed upon pumping, and recovered slowly with time evolution. The low switching field H-c1 increased abruptly from 30 to 108 G on the first several picoseconds and recovered back to the value before optical pumping within about 500 ps, whereas the high switching field H-c2 did not change obviously upon pumping, implying a domain-wall nucleation/propagation at low fields and coherent magnetization rotation at high fields in the magnetization reversal process.
引用
收藏
页数:3
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