1. Theories and recent studies: Experimental results:
Magnetization dynamics and Gilbert damping in magnetic thin film probed by Time resolved Magneto-Optical Kerr Effect
Ming Yi1, Zhifeng Chen2, Daxin Chen2, H. Sukegawa3, K. Inomata3, T. S. Lai2 and S. M. Zhou1
1Department of Physics, Fudan University, Shanghai , PRC
2State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University, Guangzhou , PRC
3Spintronics group, Magnetic Material Center, National Institute for Materials Science (NIMS), Sengen, Tsukuba, Ibaraki, Japan
Background:
magneto-optic Kerr effect has became much easier to research ultrafast process of magnetic materials with the help of femtosecond laser system and pump-probe technique. Time resolved magneto-optic Kerr effect system (TRMOKE) had been built to measure the ultrafast dynamics process of in-plane magnetized materials. Some results of demagnetization of magnetic thin films had been collected. We use the Tri-temperature model to study the relaxation of electron, spin and lattice. Recently we are concerned in the Gilbert damping and ultrafast process of spin polarized magnetic materials.
Experiment set:
Ti: Sapphire Femtosecond
Laser system
Oscillator & Regenerative Amplifier
Rep. Rate:1kHz
Power:≥200mW
Pulse Duration:≤80fs
TRMOKE
Theories and recent studies:
Experimental results:
The sample studied is Co2FeAl0.5Si0.5(CFAS) (30nm) / MgO(20nm)/MgO [001]
grown in different annealing temperature 480, 540 degrees centigrade and room temperature
Three temperature Model