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Long-range mutual synchronization of spin Hall nano-oscillators

Journal article
Authors Ahmad Awad
Philipp Dürrenfeld
Afshin Houshang
Mykola Dvornik
Ezio Iacocca
Randy K. Dumas
Johan Åkerman
Published in Nature Physics
Volume 13
Pages 292–299
ISSN 1745-2473
Publication year 2017
Published at Department of Physics (GU)
Pages 292–299
Language en
Links dx.doi.org/10.1038/nphys3927
Keywords Electronic and spintronic devices Magnetic devices Spintronics
Subject categories Physical Sciences

Abstract

The spin Hall effect in a non-magnetic metal with spin–orbit coupling injects transverse spin currents into adjacent magnetic layers, where the resulting spin transfer torque can drive spin wave auto-oscillations. Such spin Hall nano-oscillators (SHNOs) hold great promise as extremely compact and broadband microwave signal generators and magnonic spin wave injectors. Here we show that SHNOs can also be mutually synchronized with unprecedented efficiency. We demonstrate mutual synchronization of up to nine individual SHNOs, each separated by 300 nm. Through further tailoring of the connection regions we can extend the synchronization range to 4 μm. The mutual synchronization is observed electrically as an increase in the power and coherence of the microwave signal, and confirmed optically using micro-Brillouin light scattering microscopy as two spin wave regions sharing the same spectral content, in agreement with our micromagnetic simulations.

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