Long-range mutual synchronization of spin Hall nano-oscillators

Ahmad A. Awad, Philipp Dürrenfeld, A. Houshang, Mykola Dvornik, Ezio Iacocca, Randy K. Dumas, Johan Åkerman

Research output: Contribution to journalArticlepeer-review

141 Citations (Scopus)
7 Downloads (Pure)

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.
Original languageEnglish
Pages (from-to)292-299
JournalNature Physics
Volume13
Issue number3
Early online date14 Nov 2016
DOIs
Publication statusPublished - Mar 2017
Externally publishedYes

Cite this