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A single layer spin-orbit torque nano-oscillator
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2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 2362Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019. Vol. 10, article id 2362
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Condensed Matter Physics
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URN: urn:nbn:se:kth:diva-252967DOI: 10.1038/s41467-019-10120-4ISI: 000469320900004PubMedID: 31142758Scopus ID: 2-s2.0-85067048844OAI: oai:DiVA.org:kth-252967DiVA, id: diva2:1341971
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QC 20190812

Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2019-08-12Bibliographically approved

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Åkerman, Johan

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