| 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 |
| Volume: |
95 |
| Issue: |
267206 |
| Pages: |
pp. 1 - 4 |
| Keywords: |
Ginzburg-Landau equation;Landau-Lifshitz equation;magnetic thin film;nonlinear differential equation;perturbation solution;point contact;spin-momentum transfer |
| Research Areas: |
Electromagnetics |
| PDF version: |
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