Parametric oscillator based on non-linear vortex dynamics in low resistance magnetic tunnel junctions

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 o...

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Bibliographic Details
Published in:arXiv.org 2011-10
Main Authors: Martin, S, de Mestier, N, Thirion, C, Hoarau, C, Conraux, Y, Baraduc, C, Diény, B
Format: Article
Language:English
Subjects:
Alternating current
Low resistance
Nonlinear dynamics
Parametric amplifiers
Power spectral density
Radio frequency
Resonant frequencies
Synchronism
Tunnel junctions
Vortices
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Summary: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 behaviour 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 a 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1107.0867