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

1
College of Medical Laboratory, Dalian Medical University, Dalian 116044, China
2
State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 10083, China
3
College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
4
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; https://doi.org/10.3390/app8101880
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)
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Abstract

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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