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Ultrafast Modulation of Magnetization Dynamics in Ferromagnetic (Ga, Mn)As Thin Films

College of Medical Laboratory, Dalian Medical University, Dalian 116044, China
State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 10083, China
College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA
Authors to whom correspondence should be addressed.
Appl. Sci. 2018, 8(10), 1880;
Received: 31 August 2018 / Revised: 25 September 2018 / Accepted: 7 October 2018 / Published: 11 October 2018
(This article belongs to the Special Issue Optics in Spintronic Materials)
PDF [1507 KB, uploaded 11 October 2018]


Magnetization precession induced by linearly polarized optical excitation in ferromagnetic (Ga,Mn)As was studied by time-resolved magneto-optical Kerr effect measurements. The superposition of thermal and non-thermal effects arising from the laser pulses complicates the analysis of magnetization precession in terms of magnetic anisotropy fields. To obtain insight into these processes, we investigated compressively-strained thin (Ga,Mn)As films using ultrafast optical excitation above the band gap as a function of pulse intensity. Data analyses with the gyromagnetic calculation based on Landau-Lifshitz-Gilbert equation combined with two different magneto-optical effects shows the non-equivalent effects of in-plane and out-of-plane magnetic anisotropy fields on both the amplitude and the frequency of magnetization precession, thus providing a handle for separating the effects of non-thermal and thermal processes in this context. Our results show that the effect of photo-generated carriers on magnetic anisotropy constitutes a particularly effective mechanism for controlling both the frequency and amplitude of magnetization precession, thus suggesting the possibility of non-thermal manipulation of spin dynamics through pulsed laser excitations. View Full-Text
Keywords: spintronics; magneto-optical Kerr effect; (Ga,Mn)As; magnetization precession spintronics; magneto-optical Kerr effect; (Ga,Mn)As; magnetization precession

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Li, H.; Zhang, X.; Liu, X.; Dobrowolska, M.; Furdyna, J.K. Ultrafast Modulation of Magnetization Dynamics in Ferromagnetic (Ga, Mn)As Thin Films. Appl. Sci. 2018, 8, 1880.

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