Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3278602
Keywords
frustration; microwave oscillators; microwave phase shifters; phase locked oscillators
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Funding
- National Science Foundation of the USA [ECCS 0653901]
- U.S. Army TARDEC, RDECOM [W56HZW-09-P-L564]
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We demonstrate that the cooperative dynamics of an array of coupled spin-torque nano-oscillators (STNO) can be controlled by introduction of an additional external phase shift beta(c) between microwave current, which couples STNOs, and microwave voltage on the array. When this external phase shift beta(c) compensates the intrinsic phase shift beta(0), caused by the STNO nonlinearity, a phase-locking regime with increased output power and vanishing inhomogeneous linewidth broadening is achieved. In the opposite case, when external and intrinsic phase shifts are added, the STNO array demonstrates a frustration regime with low output power and wide and noisy frequency spectrum.
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