Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.237204
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Funding
- NSF [DMR-0747609, ECCS-1001815, ECCS-0967195]
- Research Corporation
- U.S. Army TARDEC, RDECOM [W56HZV-09-P-L564, W56HZV-10-P-L687]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1001815, 0967195] Funding Source: National Science Foundation
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We demonstrate that magnetic oscillations of a current-biased magnetic nanocontact can be parametrically excited by a microwave field applied at twice the resonant frequency of the oscillation. The threshold microwave amplitude for the onset of the oscillation decreases with increasing bias current, and vanishes at the transition to the auto-oscillation regime. Theoretical analysis shows that measurements of parametric excitation provide quantitative information about the relaxation rate, the spin transfer efficiency, and the nonlinearity of the nanomagnetic system.
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