Phys. Rev. Lett. 86, 728–731 (2001)Ultrafast Magnetization Reversal Dynamics Investigated by Time Domain Imaging
See accompanying Physics Focus Spatiotemporal magnetization reversal dynamics in a Ni80Fe20 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 ∼0.8 GHz mode is interpreted in terms of domain wall oscillation. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.728
DOI:
10.1103/PhysRevLett.86.728
PACS:
75.60.Ch, 75.70.Ak, 75.70.Kw, 78.20.Ls
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