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Merging droplets in double nanocontact spin torque oscillators
KTH, School of Information and Communication Technology (ICT), Material Physics (Closed 20120101), Material Physics, MF (Closed 20120101). University of Gothenburg, Sweden; Shahid Beheshti University, Tehran, Iran.
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2016 (English)In: Physical Review B, ISSN 2469-9950, Vol. 93, no 9, 094431Article in journal (Refereed) PublishedText
Abstract [en]

We demonstrate how magnetic droplet soliton pairs, nucleated by two separated nanocontact (NC) spin torque oscillators, can merge into a single droplet soliton. A detailed description of the magnetization dynamics of this merger process is obtained by micromagnetic simulations: A droplet pair with a steady-state in-phase spin precession is generated through the spin-transfer torque effect underneath two separate NCs, followed by a gradual expansion of the droplets' volume and the out-phase of magnetization on the inner side of the two droplets, resulting in the droplets merging into a larger droplet. This merger occurs only when the NC separation is smaller than a critical value. A transient breathing mode is observed before the merged droplet stabilizes into a steady precession state. The precession frequency of the merged droplet is lower than that of the droplet pair, consistent with its larger size. Merged droplets can again break up into droplet pairs at high enough magnetic field with a strong hysteretic response.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 93, no 9, 094431
Keyword [en]
Magnetic Skyrmions, Solitons, Driven, Dynamics
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URN: urn:nbn:se:kth:diva-185353DOI: 10.1103/PhysRevB.93.094431ISI: 000372712100003ScopusID: 2-s2.0-84961878129OAI: oai:DiVA.org:kth-185353DiVA: diva2:921858
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QC 20160421

Available from: 2016-04-21 Created: 2016-04-18 Last updated: 2016-04-21Bibliographically approved

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Mohseni, Seyed MajidChung, SunjaeÅkerman, Johan
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