1. Parametric oscillator based on nonlinear vortex dynamics in low-resistance magnetic tunnel junctions.
- Author
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Martin, S. Y., De Mestier, N., Thirion, C., Hoarau, C., Conraux, Y., Baraduc, C., and Diény, B.
- Subjects
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RADIO frequency , *MAGNETICS , *ELECTRICAL harmonics , *OSCILLATIONS , *ARCTIC oscillation , *MAGNETIZATION - Abstract
Radiofrequency vortex spin-transfer oscillators based on magnetic tunnel junctions with very low-resistance area product were investigated. A high power of excitations has been obtained characterized by a power spectral density containing a very sharp peak at the fundamental frequency and a series of harmonics. The observed behavior is ascribed to the combined effect of spin-transfer torque and Oersted-Ampère field generated by the large applied dc current. We furthermore show that the synchronization of a vortex oscillation by applying an ac bias current is mostly efficient when the external frequency is twice the oscillator fundamental frequency. This result is interpreted in terms of a parametric oscillator. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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