Quasilinear spin-torque nano-oscillator via enhanced negative feedback of power fluctuations

O. J. Lee, P. M. Braganca, Vlad Pribiag, D. C. Ralph, R. A. Buhrman

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We report on an approach to improving the performance of spin-torque nano-oscillators (STNOs) that utilizes power-dependent negative feedback to achieve significantly enhanced dynamic damping. In combination with a sufficiently slow variation of frequency with power, this can result in a quasilinear STNO, with weak nonlinear coupling of power and phase fluctuations over a range of bias currents and fields. An implementation of this approach that utilizes nonuniform spin torque applied to the oscillating magnetic free layer of a nanoscale spin-valve device demonstrates that highly coherent room-temperature STNOs can be achieved while retaining sufficient tunability.

Original languageEnglish (US)
Article number224411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number22
DOIs
StatePublished - Dec 11 2013
Externally publishedYes

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