Abstract
Fast magnetization reversal of uniaxial Stoner particles by spin-transfer torque generated by the spin-polarized electric current is investigated. It is found that the critical current required to reverse a magnetization can be dramatically reduced if a current with a properly designed time-dependent polarization direction is used. Under the condition that the magnitude of the current does not vary with time, the optimal time-dependent electron polarization is obtained such that the magnetization reversal is the fastest.
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