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Analytical study of magnetization dynamics driven by spin-polarized currents

By R. Bonin, C. Serpico, G. Bertotti, I. D. Mayergoyz and M. d'Aquino

Abstract

An analytical approach is presented for the study of magnetization dynamics driven by spin-polarized currents. Two cases are considered: (i) magnetic layers with in-plane uniaxial anisotropy; (ii) magnetic layers with uniaxial anisotropy and applied field perpendicular to the layer plane. Theoretical predictions are obtained for the existence of stationary modes and self-oscillations of magnetization by solving the deterministic Landau-Lifshitz-Gilbert equation with Slonczewski spin-torque term. Thermal fluctuations are studied by deriving the corresponding Fokker-Planck equation for the magnetization probability distribution. Analytical procedures to estimate the effective potential barrier separating self-oscillatory regimes and/or stationary modes are proposed. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 200775.60.Jk Magnetization reversal mechanisms, 85.70.Kh Magnetic thin film devices: magnetic heads,

DOI identifier: 10.1140/epjb/e2007-00051-5
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