Ultrafast magnetization reversal dynamics investigated by time domain imaging |
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Authors: | Choi B C Belov M Hiebert W K Ballentine G E Freeman M R |
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Institution: | Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1. |
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Abstract: | 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. |
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