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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
Keywords spinntronik, magnetism
Subject categories Magnetism, Physical Sciences


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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