Spin dynamics due to spin-transfer in magnetic spin valves

Martin Gmitra 1,2Denis Horvath 2Malgorzata Wawrzyniak 1Józef Barnaś 1,3

1. Adam Mickiewicz University, Department of Physics, Umultowska 85, Poznań 61-614, Poland
2. Department of Theoretical Physics and Astrophysics, Park Angelinum 9, Kosice 040 01, Slovakia (Slovak Rep.)
3. Polish Academy of Sciences, Institute of Molecular Physics, Mariana Smoluchowskiego 17, Poznań 60-179, Poland

Abstract

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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Presentation: oral at E-MRS Fall Meeting 2005, Symposium D, by Martin Gmitra
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-30 16:12
Revised:   2009-06-07 00:44