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(Color online) (a) Magnetic force microscope images showing the domain structures of the magnetic elements. (b) Time-resolved magneto-optical Kerr rotation (raw data) with the time scale broken between 10 and to show the three regions of interests clearly. (c) Fast Fourier transforms of the time-resolved data after double exponential background subtraction.
(a) Experimental (open circles) and fitted (gray lines) time-resolved data from magnetic dots of varying diameter at an external bias . (b) The extracted effective damping coefficient as a function of magnet diameter. The hatched rectangle shows the transition region from a high to low . (c) Experimental (open circles) and simulated (gray lines) time-resolved data from a magnetic dot of diameter at varying external bias fields. (d) The extracted for magnets with varying diameter as a function of the external bias field. A high-pass FFT filtering was applied to the experimental time-resolved data for fitting with a single damped sine function.
FFT power spectrum of the time-resolved data (filled dots) for the (a) and (b) magnets with two fitted (Gaussian) peaks as gray lines. The extracted frequencies (points) and the width of the peaks (error bars) are plotted as a function of the external bias field for the (c) and (d) magnets. The hatched region in (c) shows the overlap between the two modes.
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