Investigation of an effective anisotropy field involved in photoinduced precession of magnetization in (Ga,Mn)As
Investigation of an effective anisotropy field involved in photoinduced precession of magnetization in (Ga,Mn)As
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DOI：
10.1063/1.3073848
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发表时间：
2009-03
影响因子：
3.2
通讯作者：
Syuuhei Kobayashi;Y. Hashimoto;H. Munekata
中科院分区：
文献类型：
--
作者：
Syuuhei Kobayashi;Y. Hashimoto;H. Munekata
用时间分辨磁光测量方法研究了（Ga，Mn）As中Mn含量在0.01 ≤ x ≤ 0.11范围内的光致磁化旋进。结果发现，有效的各向异性场随Mn含量的增加而减小。从不同温度下测量的光生旋进中提取了各向异性场，并与磁化强度进行了比较。随着泵浦功率的增加，磁光信号的振荡幅度显著增强。讨论了各向异性场随泵浦功率变化的机理。
Photoinduced precession of magnetization in (Ga,Mn)As was studied for a wide range of Mn contents (0.01≤x≤0.11) by time-resolved magneto-optical measurements. It was found that an effective anisotropy field decreases with increasing Mn contents. Anisotropy fields were also extracted from photoinduced precession measured at different temperatures and compared with magnetization. Significant enhancement in the amplitude of oscillation in magneto-optical signals occurred with increasing pump power. The mechanism of a change in the anisotropy field with the pump power was discussed.