Ultrafast magnetization reversal dynamics investigated by time domain imaging.
Spatiotemporal magnetization reversal dynamics in a Ni(80)Fe(20) microstructure is studied using ps time scale scanning Kerr microscopy. Time domain images reveal a striking change in the reversal associated with the reduction in switching time when a transverse bias field is applied. Magnetization oscillations subsequent to reversal are observed at two resonance frequencies, which sensitively depend on the bias field strength. The oscillation at f = 2 GHz is caused by the damped precession of M, while the lower frequency approximately 0.8 GHz mode is interpreted in terms of domain wall oscillation.
Choi
B C
BC
Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1.
Belov
M
M
Hiebert
W K
WK
Ballentine
G E
GE
Freeman
M R
MR