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A 20 nm spin Hall nano-oscillator

Journal article
Authors Philipp Dürrenfeld
Ahmad Awad
Afshin Houshang
Randy K. Dumas
Johan Åkerman
Published in Nanoscale
Volume 9
Issue 3
Pages 1285-1291
ISSN 2040-3364
Publication year 2017
Published at Department of Physics (GU)
Pages 1285-1291
Language en
Links doi.org/10.1039/c6nr07903b
Keywords magnetic droplet solitons, torque oscillators, driven, excitation, waves, generation, multilayer, Chemistry, Science & Technology - Other Topics, Materials Science, Physics
Subject categories Chemical Sciences, Physical Sciences

Abstract

Hall nano-oscillators (SHNOs) are an emerging class of pure spin current driven microwave signal generators. Through the fabrication of 20 nm nano-constrictions in Pt/NiFe bilayers, we demonstrate that SHNOs can be scaled down to truly nanoscopic dimensions, with the added benefit of ultra-low operating currents and improved power conversion efficiency. The lateral confinement leads to a strong shape anisotropy field as well as an additional demagnetizing field whose reduction with increasing autooscillation amplitude can yield a positive current tunability contrary to the negative tunability commonly observed for localized excitations in extended magnetic layers. Micromagnetic simulations corroborate the experimental findings and suggest that the active magnetodynamic area resides up to 100 nm outside of the nano-constriction.

Page Manager: Webmaster|Last update: 9/11/2012
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