Spin-polarized current-induced magnetization precession and switching for perpendicular anisotropic ferrimagnetic thin films

We present here a theoretical calculation on magnetization precession and switching induced by spin-polarized current spin-transfer torque using perpendicular anisotropic magnetic multilayered thin films which contain two strongly coupled antiparallel magnetic subnetworks. We develop a modified Landau-Lifshitz-Gilbert equation for this material structure to obtain the final equation governing the dynamics of the net magnetization. We present results of the time evolution of the net magnetization under the influence of a spin current as well as the estimation of the critical current for practical application in magnetic random access memory writing. A relation between magnetization switching time and current is also given. (C) 2006 American Institute of Physics.