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(a) Time-resolved polar Kerr signal measured with various magnetic fields at and . Each curve is upshifted for clarity. (b) Static Kerr loops measured at several representative times. The signal difference before and after the pump excitation corresponds to the time-resolved Kerr signal. (c) Precession signal (black circles) and its fitting curve (red solid line) after considering the time trace of the remagnetization (blue rectangles).
External magnetic field dependence of the precession frequency (black rectangles) and the relaxation characteristic time (blue circles) (a), and of the Gilbert damping parameter (b) at .
Visualization of the trajectory, vs in real space at . By judging from the lack of a turning point in , it is suggested that the relaxation time is comparable to the precession period.
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