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Width dependent auto-oscillating properties of constriction based spin Hall nano-oscillators

Journal article
Authors Ahmad Awad
Afshin Houshang
Mohammad Zahedinejad
Roman Khymyn
Johan Åkerman
Published in Applied Physics Letters
Volume 116
Issue 23
ISSN 0003-6951
Publication year 2020
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1063/5.0007254
Keywords driven, Physics
Subject categories Physical Sciences

Abstract

We study the current tunable microwave signal properties of nano-constriction-based spin Hall nano-oscillators in oblique magnetic fields as a function of the nano-constriction width, w = 50 - 140 nm. The threshold current is found to scale linearly with w, defining a constant threshold current density of Jth = 1.7 x 10(8) A/cm(2). While the current dependence of the microwave frequency shows the same generic non-monotonic behavior for all w >= 80 nm, the quality of the generated microwave signal improves strongly with w, as the total power increases and the linewidth decreases linearly with w. As a consequence, the peak power for a 140 nm nano-constriction is about an order of magnitude higher than that for an 80 nm nano-constriction. The smallest nano-constriction, w = 50 nm, exhibits a different behavior with a higher power and a worse linewidth, indicating a crossover into a qualitatively different narrow-constriction regime.

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