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Oscillatory transient regime in the forced dynamics of a nonlinear auto oscillator

Journal article
Authors Yan Zhou
Vasil Tiberkevich
Giancarlo Consolo
Ezio Iacocca
Bruno Azzerboni
Andrei Slavin
Johan Åkerman
Published in Physical Review B
Volume 82
Issue 1
Pages 012408 (4 pages)
ISSN 1098-0121
Publication year 2010
Published at Department of Physics (GU)
Pages 012408 (4 pages)
Language en
Links prb.aps.org/abstract/PRB/v82/i1/e01...
Keywords spinntronik, magnetism
Subject categories Magnetism, Physical Sciences

Abstract

We demonstrate that the forced transient dynamics of a nonlinear (nonisochronous) auto-oscillator is qualitatively different from the dynamics of a quasilinear oscillator described by the classical Adler’s model. If the normalized amplitude μ of the driving force exceeds a certain critical value μcr, the transition to the synchronized regime becomes oscillatory with a frequency proportional to ∝√μ−μcr and a synchronization time that is almost independent of μ. The discovered effect is illustrated on the example of a strongly nonlinear spin torque nano-oscillator (STNO) where the finite transient synchronization time can limit the possible range of STNO modulation frequencies.

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