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Direct observation of magnetization dynamics generated by nanocontact spin-torque vortex oscillators

Journal article
Authors P. S. Keatley
S. R. Sani
G. Hrkac
S. M. Mohseni
Philipp Dürrenfeld
T. H. J. Loughran
Johan Åkerman
R. J. Hicken
Published in Physical Review B
Volume 94
Issue 6
ISSN 2469-9950
Publication year 2016
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1103/PhysRevB.94.0604...
Keywords NANO-OSCILLATORS, PHASE-LOCKING, EXCITATION, DRIVEN
Subject categories Physical Sciences

Abstract

Time-resolved scanning Kerr microscopy has been used to directly image the magnetization dynamics of nanocontact (NC) spin-torque vortex oscillators (STVOs) when phase locked to an injected microwave (rf) current. The Kerr images reveal free-layer magnetization dynamics that extend outside the NC footprint, where they cannot be detected electrically, but which are crucial to phase-lock STVOs that share common magnetic layers. For a single NC, dynamics were observed not only when the STVO frequency was fully locked to that of the rf current, but also for a partially locked state characterized by periodic changes in the core trajectory at the rf frequency. For a pair of NCs, we explore the correlation between the spatial character of injection-locked dynamics and the free-running spectra. Insight gained from these images may improve understanding of the conditions required for mutual phase locking of multiple STVOs, and hence enhanced microwave power emission.

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