Distribution of the magnetization reversal duration in sub-ns spin-transfer switching

Details Distribution of the magnetization reversal duration in sub-ns spin-transfer switching Distribution of the magnetization reversal duration in sub-ns spin-transfer switching

2006-09-27

arxiv.org/abs/cond-mat/0609687v1

Physics

Condensed Matter

Strongly Correlated Electrons

submitted to PRB

Scientific paper

10.1103/PhysRevB.75.064402

We study the distribution of switching times in spin-transfer switching induced by sub-ns current pulses in pillar-shaped spin-valves. The pulse durations leading to switching follow a comb-like distribution, multiply-peaked at a few most probable, regularly spaced switching durations. These durations reflect the precessional nature of the switching, which occurs through a fluctuating integer number of precession cycles. This can be modeled considering the thermal variance of the initial magnetization orientations and the occurrence of vanishing total torque in the possible magnetization trajectories. Biasing the spin-valve with a hard axis field prevents some of these occurrences, and can provide an almost perfect reproducibility of the switching duration.

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