The current-induced dynamics of magnetic moments in a spin valve structure is studied theoretically using a macroscopic model of spin transfer torque and numerical solution of the Landau-Lifshitz-Gilbert equation. The latter equation is generalized by including the torque due to spin transfer, which has been determined from the classical spin diffusion theory and macroscopic boundary conditions for the longitudinal and transverse components of the spin current.

The description includes parameters which can be taken from experiments on CPP-GMR, like bulk and interfacial spin asymmetry parameters,spin-diffusion lengths, bulk and interface resistances, and others. Some of the experimentally observed features , for instance the normal and inverse switching, hysteretic switching of the magnetic layer, as well as oscillatory magnetization modes can be qualitatively reproduced by the description.

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