Switching speed distribution of spin-torque-induced magnetic reversal
J. He, J. Z. Sun, S. Zhang
Abstract
The switching probability of a single-domain ferromagnet under spin-current excitation is evaluated using the Fokker-Planck equation(FPE). In the case of uniaxial anisotropy, the FPE reduces to an ordinary differential equation in which the lowest eigenvalue λ1 determines the slowest switching events. We have calculated λ1 by using both analytical and numerical methods. It is found that the previous model based on thermally distributed initial magnetization states Sun1 can be accurately justified in some useful limiting conditions.
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