(Color online) (a) MOKE hysteresis loop obtained at the center of the Co/Pt strip with magnetic field sweep rate ∼20 kOe/s and 100 cycles averaged. (b) Scanning electron micrograph of the Co/Pt strip and electrodes, along with a schematic of the DW nucleation and detection.
(Color online) Stochastic nature of thermally activated DW motion, measured at driving field H = 152 Oe. (a) Single-shot MOKE signal transients measured at x = 8.8 μm. (b) Distribution of switching times tsw due to DW motion 2.8 and 8.8 μm away from the point of DW nucleation. (c) Averaged DW transients at different points on the strip (each an average of 100 transients). The inset shows a plot of average DW arrival time t 1/2 against probed position, with the linear fit used to estimate the DW velocity v = 4.9 × 10−3 m/s.
(Color online) Averaged reversal transients at driving fields (a) H = 200 Oe (v = 5.6 m/s) and (b) H = 233 Oe (v = 21.6 m/s), measured at different positions away from the point of DW nucleation. The continuous curves show (a) exponential decay and (b) error function fits to the data. (b) Plot of average DW arrival time t 1/2 as a function of probed position. DW velocities are extracted from linear fits.
(Color online) (a) Logarithm of DW velocity v plotted against driving field H. (b) v plotted against H, with the line serving as a guide for the eye to estimate the DW mobility μ ∼ 0.09 m/(s Oe).
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