Analytical study of magnetization dynamics driven by spin-polarized currents
- 200 Downloads
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.
PACS.75.60.Jk Magnetization reversal mechanisms 85.70.Kh Magnetic thin film devices: magnetic heads
Unable to display preview. Download preview PDF.
- J.C. Slonczewski, J. Magn. Magn. Mater. 159, L1 (1996) Google Scholar
- J.C. Slonczewski, J. Magn. Magn. Mater. 195, L261 (1999) Google Scholar
- G. Bertotti, I.D. Mayergoyz, C. Serpico, in The Science of Hysteresis. Volume II: Physical Modeling, Micromagnetics, and Magnetization Dynamics, edited by G. Bertotti, I.D. Mayergoyz (Elsevier, Oxford, 2006), p. 435 Google Scholar
- L. Perko, Differential Equations and Dynamical Systems (Springer-Verlag, New York, 1996) Google Scholar
- C.W. Gardiner, Handbook of Stochastic Methods (Springer-Verlag, Berlin, Germany, 1985) Google Scholar
- R. Kubo, N. Hashitsume, Suppl. Progr. Theor. Phys. 46 (1970) Google Scholar
- R.L. Stratonovich, Topics in the Theory of Random Noise, (Gordon and Breach, New York, 1963), Vol. I Google Scholar
- M.I Freidlin, A.D. Wentzell, Mem. Am. Math. Soc. 109, No. 523 (2006) Google Scholar