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.
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Dalian Med Univ, Coll Med Lab, Dalian 116044, Peoples R China
Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 10083, Peoples R ChinaDalian Med Univ, Coll Med Lab, Dalian 116044, Peoples R China
Li, Hang
Zhang, Xinhui
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Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 10083, Peoples R China
Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R ChinaDalian Med Univ, Coll Med Lab, Dalian 116044, Peoples R China
Zhang, Xinhui
Liu, Xinyu
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Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USADalian Med Univ, Coll Med Lab, Dalian 116044, Peoples R China
Liu, Xinyu
Dobrowolska, Margaret
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Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USADalian Med Univ, Coll Med Lab, Dalian 116044, Peoples R China
Dobrowolska, Margaret
Furdyna, Jacek K.
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Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USADalian Med Univ, Coll Med Lab, Dalian 116044, Peoples R China