Collective magnetization dynamics in ferromagnetic (Ga,Mn)As mediated by photoexcited carriers

被引：5
|
作者：
Li, Hang [1 ]
Liu, Xinyu [2 ]
Zhou, Ying-Yuan [2 ]
Furdyna, Jacek K. [2 ]
Zhang, Xinhui [1 ]
机构：
[1] Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R China
[2] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA
来源：
PHYSICAL REVIEW B | 2015年 / 91卷 / 19期
基金：
中国国家自然科学基金; 美国国家科学基金会;
关键词：
SPIN; SEMICONDUCTORS; PRECESSION; NICKEL; TORQUE;
D O I：
10.1103/PhysRevB.91.195204
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present a study of photoexcited magnetization dynamics in ferromagnetic (Ga,Mn)As films observed by time-resolved magneto-optical measurements. The magnetization precession triggered by linearly polarized optical pulses in the absence of an external field shows a strong dependence on photon frequency when the photoexcitation energy approaches the band edge of (Ga,Mn)As. This can be understood in terms of magnetic anisotropy modulation by both laser heating of the sample and by hole-induced nonthermal paths. Our findings provide a means for identifying the transition of laser-triggered magnetization dynamics from thermal to nonthermal mechanisms, a result that is of importance for ultrafast optical spin manipulation in ferromagnetic materials via nonthermal paths.
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页数：8
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