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Ultrafast generation and dynamics of isolated skyrmions in antiferromagnetic insulators
Inst Adv Studies Basic Sci, Zanjan, Iran.
Inst Adv Studies Basic Sci, Zanjan, Iran;Norwegian Univ Sci & Technol, Dept Phys, Ctr Quantum Spintron, NO-7491 Trondheim, Norway.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Norwegian Univ Sci & Technol, Dept Phys, Ctr Quantum Spintron, NO-7491 Trondheim, Norway.
2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, no 5, article id 054423Article in journal (Refereed) Published
Abstract [en]

Based on atomistic spin dynamics simulations, we report the ultrafast generation of single antiferromagnetic (AFM) skyrmions in a confined geometry. This process is achieved through an effective magnetic field induced by the athermal inverse Faraday effect from a short laser pulse. The resulting field can nucleate an isolated skyrmion as a topologically protected metastable state in a collinear antiferromagnet with small Dzyaloshinskii-Moriya interaction. The radius of a single skyrmion is shown to increase by applying a uniform dc magnetic field and at increasing temperature. To investigate possible AFM spin-caloritronics phenomena, we investigate the skyrmion dynamics under an applied temperature gradient both analytically and numerically. The antiferromagnetic skyrmions move longitudinally toward the hotter region, but in contrast, small skyrmions in the very low damping regime move toward the colder side, irrespective of the staggered topological charge number, with a speed that is much faster than that of their ferromagnetic counterparts.

Place, publisher, year, edition, pages
2019. Vol. 99, no 5, article id 054423
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-379039DOI: 10.1103/PhysRevB.99.054423ISI: 000459321500003OAI: oai:DiVA.org:uu-379039DiVA, id: diva2:1295322
Funder
EU, European Research Council, 669442Available from: 2019-03-11 Created: 2019-03-11 Last updated: 2019-03-11Bibliographically approved

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