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A single layer spin-orbit torque nano-oscillator.

Journal article
Authors Mohammad Haidar
Ahmad Awad
Mykola Dvornik
Roman Khymyn
Afshin Houshang
Johan Åkerman
Published in Nature communications
Volume 10
Issue 1
Pages 2362
ISSN 2041-1723
Publication year 2019
Published at Department of Physics (GU)
Pages 2362
Language en
Links dx.doi.org/10.1038/s41467-019-10120...
www.ncbi.nlm.nih.gov/entrez/query.f...
Subject categories Condensed Matter Physics, Physical Sciences, Nano Technology

Abstract

Spin torque and spin Hall effect nano-oscillators generate high intensity spin wave auto-oscillations on the nanoscale enabling novel microwave applications in spintronics, magnonics, and neuromorphic computing. For their operation, these devices require externally generated spin currents either from an additional ferromagnetic layer or a material with a high spin Hall angle. Here we demonstrate highly coherent field and current tunable microwave signals from nano-constrictions in single 15-20 nm thick permalloy layers with oxide interfaces. Using a combination of spin torque ferromagnetic resonance measurements, scanning micro-Brillouin light scattering microscopy, and micromagnetic simulations, we identify the auto-oscillations as emanating from a localized edge mode of the nano-constriction driven by spin-orbit torques. Our results pave the way for greatly simplified designs of auto-oscillating nano-magnetic systems only requiring single ferromagnetic layers with oxide interfaces.

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