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

Title
Quasilinear spin-torque nano-oscillator via enhanced negative feedback of power fluctuations
Authors
이억재P. M. BragancaV. S. PribiagD. C. RalphR. A. Buhrman
Issue Date
2013-12
Publisher
Physical review B, Condensed matter and materials physics
Citation
VOL 88, NO 22-224411-10
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.
URI
http://pubs.kist.re.kr/handle/201004/65305
ISSN
2469-9950
Appears in Collections:
KIST Publication > Article
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