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Magnetic droplet nucleation boundary in orthogonal spin-torque nano-oscillators
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. Univ Gothenburg, Sweden.
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.
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2016 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 7, 11209Article in journal (Refereed) PublishedText
Abstract [en]

Static and dynamic magnetic solitons play a critical role in applied nanomagnetism. Magnetic droplets, a type of non-topological dissipative soliton, can be nucleated and sustained in nanocontact spin-torque oscillators with perpendicular magnetic anisotropy free layers. Here, we perform a detailed experimental determination of the full droplet nucleation boundary in the current-field plane for a wide range of nanocontact sizes and demonstrate its excellent agreement with an analytical expression originating from a stability analysis. Our results reconcile recent contradicting reports of the field dependence of the droplet nucleation. Furthermore, our analytical model both highlights the relation between the fixed layer material and the droplet nucleation current magnitude, and provides an accurate method to experimentally determine the spin transfer torque asymmetry of each device.

Place, publisher, year, edition, pages
Nature Publishing Group, 2016. Vol. 7, 11209
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Nano Technology
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URN: urn:nbn:se:kth:diva-186565DOI: 10.1038/ncomms11209ISI: 000374266800001PubMedID: 27088301OAI: oai:DiVA.org:kth-186565DiVA: diva2:927949
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QC 20160513

Available from: 2016-05-13 Created: 2016-05-13 Last updated: 2016-05-13Bibliographically approved

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Chung, SunjaeEklund, AndersÅkerman, Johan
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