Dynamics of photoinduced magnetization rotation in ferromagnetic semiconductor p -(Ga,Mn)As
Dynamics of photoinduced magnetization rotation in ferromagnetic semiconductor p -(Ga,Mn)As
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DOI：
10.1103/physrevb.69.033203
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发表时间：
2004-01
影响因子：
3.7
通讯作者：
Y. Mitsumori;A. Oiwa;T. Słupinski;H. Maruki;Y. Kashimura;F. Minami;H. Munekata
中科院分区：
文献类型：
--
作者：
Y. Mitsumori;A. Oiwa;T. Słupinski;H. Maruki;Y. Kashimura;F. Minami;H. Munekata
通过仔细比较光致极克尔旋转的时间分布与光致反射率变化的时间分布，研究了铁磁 p-(Ga,Mn)As 中光致磁化旋转的动力学。铁磁耦合 Mn 自旋的旋转是由光生空穴自旋在 100 fs 的激发脉冲宽度内引起的，而由于强阻尼，弛豫在数十皮秒内发生。观察结果表明，空穴和 Mn 自旋在光激发下一起旋转和弛豫。这将是空穴介导的铁磁系统中出现的不同类型的激发（耦合空穴-锰自旋复合物）。
Dynamics of photoinduced magnetization rotation was studied in ferromagnetic p-(Ga,Mn)As by carefully comparing the temporal profile of the photoinduced polar Kerr rotation with that of the photoinduced reflectivity change. Rotation of ferromagnetically coupled Mn spins is induced by photogenerated hole spins within the excitation pulse width of a 100 fs, whereas relaxation takes place in tens of picosecond as a result of strong damping. Observed results suggest that hole and Mn spins rotate and relax together upon optical excitation. This would be a different type of excitation (coupled hole-Mn spin complex) appearing in the hole-mediated ferromagnetic system.