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Low-current, narrow-linewidth microwave signal generation in NiMnSb based single-layer nanocontact spin-torque oscillators
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2016 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 109, no 22, article id 222403Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2016. Vol. 109, no 22, article id 222403
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Physical Sciences
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URN: urn:nbn:se:kth:diva-199757DOI: 10.1063/1.4968813ISI: 000390243100029Scopus ID: 2-s2.0-85000624517OAI: oai:DiVA.org:kth-199757DiVA, id: diva2:1067350
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QC 20170120

Available from: 2017-01-20 Created: 2017-01-16 Last updated: 2017-11-29Bibliographically approved

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Chung, SunjaeÅkerman, Johan

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