Destabilization of serially connected spin-torque oscillators via non-Adlerian dynamics
Journal article, 2011

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.

spintronics

magnetism

microwave electronics

Author

Ezio Iacocca

University of Gothenburg

Johan Åkerman

University of Gothenburg

Journal of Applied Physics

0021-8979 (ISSN) 1089-7550 (eISSN)

Vol. 110 10 103910-

Subject Categories

Condensed Matter Physics

DOI

10.1063/1.3662175

More information

Created

10/10/2017