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arXiv · 0803.0704

Micromagnetic study of a spin-torque oscillator based on a magnetic nano-contact magnetized at an arbitrary angle

G. Consolo·B. Azzerboni·L. Lopez-Diaz·G. Gerhart·E. Bankowski·V. Tiberkevich·A. N. Slavin
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Abstract

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.

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G. Consolo, B. Azzerboni, L. Lopez-Diaz, G. Gerhart, E. Bankowski, V. Tiberkevich, A. N. Slavin. 2008-03-05. Micromagnetic study of a spin-torque oscillator based on a magnetic nano-contact magnetized at an arbitrary angle. https://doi.org/10.1103/physrevb.78.014420

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