title: Ultrafast magnetization reversal dynamics investigated by time domain imaging.
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.
authors.affiliation: Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1.
authors.forename: B C
authors.initials: BC
authors.lastname: Choi
authors.forename: M
authors.initials: M
authors.lastname: Belov
authors.forename: W K
authors.initials: WK
authors.lastname: Hiebert
authors.forename: G E
authors.initials: GE
authors.lastname: Ballentine
authors.forename: M R
authors.initials: MR
authors.lastname: Freeman