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Precessional modes due to spin-transfer in spin-valve nanopillars

Gmitra M., Barnaś J., Horváth D.

Materials Science Poland

2007

Vol. 25, No. 2

571--576

Current-driven magnetic switching and magnetic dynamics in spin-valve nanopillars are considered in the framework of the macrospin model. The corresponding spin transfer torque is calculated in terms of the macroscopic model based on spin diffusion equations. Critical currents for switching from parallel to antiparallel magnetic configurations and to precessional regime are derived. Frequencies of the precessional modes are also calculated as a function of external magnetic field and electric current.