Coherent Control of Precessional Dynamics in Thin Film Permalloy
T. M. Crawford, Pavel Kabos, Thomas J. Silva
We demonstrate a method of eliminating overshoot and ringing in magnetizaiton dynamics when the system bandwidth includes the intrinsic ferromagnetic resonance (FMR). The method employsstaggered step excitation for the cancellation of FMR oscillations while maximizing the risetime of the magnetization response. The second-hermonic magneto-optic Kerr effect is used to measure the magnetic response at a localized spot on the sample. The measured response is adequately modeled with the Landau-Lifshitz-Gilbert differential nist-equation. We explain the observed behavior in termsof destructive interference.