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Low-current, narrow-linewidth microwave signal generation in NiMnSb based single-layer nanocontact spin-torque oscillators

Journal article
Authors Philipp Dürrenfeld
F. Gerhard
Mojtaba Ranjbar
S. R. Sani
Sunjae Chung
C. Gould
L. W. Molenkamp
Johan Åkerman
Published in Applied Physics Letters
Volume 109
Issue 22
ISSN 0003-6951
Publication year 2016
Published at Department of Physics (GU)
Language en
Links 10.1063/1.4968813
Keywords excitation, waves
Subject categories Physical Sciences

Abstract

We report on the fabrication of nano-contact spin-torque oscillators based on single layers of the epitaxially grown half-metal NiMnSb with ultralow spin wave damping. We demonstrate magnetization auto-oscillations at microwave frequencies in the 1-3 GHz range in out-of-plane magnetic fields. Threshold current densities as low as 3 x 10(11) A m(-2) are observed as well as minimum oscillation linewidths of 200 kHz, both of which are much lower than the values achieved in conventional metallic spin-valve-based devices of comparable dimensions. These results enable the fabrication of spin transfer torque driven magnonic devices with low current density requirements, improved signal linewidths, and in a simplified single-layer geometry. Published by AIP Publishing.

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