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|Author(s):||Mark Hoefer; Mark J. Ablowitz; Boaz Ilan; Matthew R. Pufall; Thomas J. Silva;|
|Title:||Theory of Magnetodynamics Induced by Spin Torque in Perpendicularly Magnetized Thin Films|
|Published:||December 31, 2005|
|Abstract:||A nonlinear model of spin-wave excitation using a point contact in a thin ferromagnetic film is introduced. Large-amplitude magnetic solitary waves are computed, which help explain recent spin-torque experiments. Numerical simulations of the fully nonlinear model predict excitation frequencies in excess of 0.2 THz for contact diameters smaller than 6 nm. Simulations also preduct a saturation and redshift of the frequency at currents large enough to invert the magnetization under the point contact. The theory is approximated by a cubic complex Ginzburg-Landau type equation. The mode's nonlinear frequency shift is found by use of perturbation techniques, whose results agree with those of direct numerical simulations.|
|Citation:||Physical Review Letters|
|Pages:||pp. 1 - 4|
|Keywords:||Ginzburg-Landau equation,Landau-Lifshitz equation,magnetic thin film,nonlinear differential equation,perturbation solution,point contact,spin-momentum transfer|
|PDF version:||Click here to retrieve PDF version of paper (246KB)|