TY - JOUR
T1 - Micromagnetic studies of laser-induced magnetization dynamics in FePt-C Films
AU - Miao, Jingyue
AU - Wang, Jian
AU - Mandal, Ruma
AU - Wei, Dan
AU - Takahashi, Yukiko K.
AU - Hono, Kazuhiro
N1 - Funding Information:
ACKNOWLEDGMENT This work was supported by the National Natural Science Foundation of China under Grant 51371101 and Grant 11674142.
Publisher Copyright:
© 1965-2012 IEEE.
PY - 2018/11
Y1 - 2018/11
N2 - Laser-induced magnetization dynamics has been studied extensively and involves the thermally induced magnetization switching and the assistance to break the symmetry of switching. In this paper, the effects of the laser focus on the laser heating and the temperature profile in the FePt-C granular media are determined by measuring the Kerr signal via all-optical time-resolved magneto-optical Kerr effect. Based on that, we utilize the hybrid Monte Carlo micromagnetic method to simulate laser-induced magnetization dynamics in FePt-C films with different external magnetic fields and laser fluences. The results show that the magnetization dynamics includes an ultrafast demagnetization, a slower magnetization recovery, and a long-timescale magnetization reversal or the continuing recovery, depending on the magnitude of laser fluence and the external magnetic field.
AB - Laser-induced magnetization dynamics has been studied extensively and involves the thermally induced magnetization switching and the assistance to break the symmetry of switching. In this paper, the effects of the laser focus on the laser heating and the temperature profile in the FePt-C granular media are determined by measuring the Kerr signal via all-optical time-resolved magneto-optical Kerr effect. Based on that, we utilize the hybrid Monte Carlo micromagnetic method to simulate laser-induced magnetization dynamics in FePt-C films with different external magnetic fields and laser fluences. The results show that the magnetization dynamics includes an ultrafast demagnetization, a slower magnetization recovery, and a long-timescale magnetization reversal or the continuing recovery, depending on the magnitude of laser fluence and the external magnetic field.
KW - Hybrid Monte Carlo (HMC) micromagnetics
KW - laser-induced magnetization
KW - temperature profile
KW - time-resolved magneto-optical Kerr effect (TR-MOKE)
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U2 - 10.1109/TMAG.2018.2832285
DO - 10.1109/TMAG.2018.2832285
M3 - Article
AN - SCOPUS:85048563695
SN - 0018-9464
VL - 54
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 11
M1 - 8385208
ER -