Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-03-05
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
27 pages, 5 figure, paper submitted to Physical Review B
Scientific paper
10.1103/PhysRevB.78.014420
The nature of spin wave modes excited by spin-polarized direct current in a spin-torque auto-oscillator based on a magnetic nanocontact was studied by a micromagnetic simulation in the case when the external bias magnetic field was rotated from the in-plane to perpendicular-to-plane orientation. In qualitative agreement with the weakly-nonlinear analytical theory it was found, that at a certain critical angle, an abrupt switching from the self-localized nonlinear "bullet" mode to a propagating quasi-linear Slonczewski mode takes place, and is accompanied by an upward jump in generated microwave frequency. It was, also, found that the analytical theory overestimates the magnitude of a critical magnetization angle, corresponding to the mode switching, and that the magnitude of the frequency jump caused by the mode switching is inversely proportional to the nanocontact radius.
Azzerboni Bruno
Bankowski Elena
Consolo Giancarlo
Gerhart Grant
Lopez-Diaz L.
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