Journal
PHYSICAL REVIEW B
Volume 86, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.104418
Keywords
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Funding
- French National Research Agency (ANR) [ANR-09-NANO-037]
- Carnot-RF project and Nano convention
- FP7-People-IEF Program [252067]
- National Science Foundation [ECCS-1001815]
- DARPA
- U.S. Army TARDEC
- U.S. Army RDECOM
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In an isochronous auto-oscillator, where the auto-oscillation frequency f does not depend on the oscillation amplitude, the linewidth of the nth harmonic is n(2) times larger than the linewidth of the main auto-oscillation mode. Here we present a theoretical description that predicts that the increase in the linewidth of higher harmonics with harmonic number n is substantially slower in the case of a nonisoschronous oscillator, where f depends strongly on amplitude. Using spin-torque nano-oscillators as an example of a nonisochronous oscillator, this description is confirmed numerically and experimentally. The presented model allows one to extract important nonlinear parameters of an auto-oscillator of any physical nature from the measurement of higher harmonic linewidths.
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