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Destabilization of serially connected spin-torque oscillators via non-Adlerian dynamics

Journal article
Authors Ezio Iacocca
Johan Åkerman
Published in Journal of Applied Physics
Volume 110
Issue 10
Pages 103910
ISSN 0021-8979
Publication year 2011
Published at Department of Physics (GU)
Pages 103910
Language en
Links dx.doi.org/10.1063/1.3662175
Keywords magnetism, spintronics, microwave electronics
Subject categories Magnetism

Abstract

The transient dynamics of phase-locking in serially connected nanopillar spin-torque oscillators (STOs) is studied both analytically and numerically. A variety of transient behaviors are observed stemming from the high oscillator nonlinearity and the interplay between the damping to coupling strength ratio and the phase delay of the coupling. Non-Adlerian (ringing) dynamics is found to be the main regime of synchronization where the synchronization time depends strongly on the phase delay. Somewhat nonintuitively, sufficiently strong coupling can also destabilize the system, destroying the synchronized regime even for identical STOs. This transient behavior is also found to dominate when the STOs have different frequencies. These results highlight fundamental issues that must be considered in the design of serially synchronized STOs.

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