Journal
APPLIED SCIENCES-BASEL
Volume 8, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/app8101880
Keywords
spintronics; magneto-optical Kerr effect; (Ga,Mn)As; magnetization precession
Categories
Funding
- National Key R&D Program of China [2017YFB0405700]
- National Natural Science Foundation of China [81601855]
- Foundation of Liaoning Educational Committee [L2016036]
- NSF [DMR14-00432]
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available