Citation
K. Ito
,
T. Devolder
,
C. Chappert
,
M. J. Carey
,
J. A. Katine; Probabilistic behavior in subnanosecond spin transfer torque switching.
J. Appl. Phys.
15 April 2006; 99 (8): 08G519.
https://doi.org/10.1063/1.2176869
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We studied the magnetization dynamics induced by spin transfer torque (STT) in
nanopillars using Landau-Lifshitz-Gilbert micromagnetic simulations including the STT term given by
Slonczewski [
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and a Gaussian thermal random force. Our simulation results clearly show the probabilistic switching behavior. The antiparallel to parallel switching at
requires a smaller overdrive current than at
. The parallel to antiparallel switching is not dependent on temperature. Our results show that C-like bending induced by the Ampere field plays an important role rather than the misalignment which arises from the thermal magnetization fluctuation.
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