Ultrafast Magnetization Reversal Dynamics Investigated by Time Domain Imaging
- 22 January 2001
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 86 (4) , 728-731
- https://doi.org/10.1103/physrevlett.86.728
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.Keywords
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