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(Color) (a) Measurement procedure: a low frequency current ramp is passed through the sample to measure resistance vs current hysteresis loop. A short negative pulse is sent when the ramp current is zero; (b) The hysteresis loop either remains unaffected (left panel) or shows a sudden jump at zero low frequency current if the pulse succeeds in reversing the magnetization (right panel); (c) Averaged hysteresis loops obtained at , showing the transition from antiparallel to parallel state upon application of current pulses of of various durations.
(Color) Map of the switching probability for the pulsed current induced antiparallel to parallel transition at , plotted as function of the pulse current amplitude (normalized to the dc critical current) and the pulse duration. The black area at short low current pulses denotes zero probability, whereas the light blue area at long high current pulses indicates 100% probability. The color code scales linearly with the switching probability.
Temperature and current amplitude dependence of the switching speed as for antiparallel to parallel transition (panel A) and parallel to antiparallel transition (panel B) at various temperatures between 150 and . The solid lines are guide to the eye.
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