Switching probability investigation of electric field-induced precessional magnetization switching

Abstract

We report theoretical investigation of the switching probability of electric field-induced precessional magnetization switching by solving the Fokker-Planck equation numerically with finite difference method. The switching probability is determined by the net magnetic field induced by the deviation of precession angle from its equilibrium position after precession process. The error rate has the lowest value under an appropriate applied external field for the voltage pulse duration ${\tau}_{pulse}$ a little longer than the half precession period. The calculated results show that ultra-low error rate down to the order of $10^{-12}$ can be achieved for thermal stability factor {\Delta} = 50 and low damping factor material should be used for free layer to improve the switching probability. For parallel (anti-parallel) magnetization to anti-parallel (parallel) magnetization switching process, the spin transfer torque tends to decrease (increase) the error rate when the ${\tau}_{pulse}$ is shorter than the half precession period, and increase (decrease) the error rate when ${\tau}_{pulse}$ is longer than the half-period. These results exhibit potential of electric field-induced precessional magnetization switching for ultra-low power, high speed magnetic random access memory (MRAM) application.