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Enhanced skyrmion stability due to exchange frustration
Univ Kiel, Inst Theoret Phys & Astrophys, D-24098 Kiel, Germany..
Univ Kiel, Inst Theoret Phys & Astrophys, D-24098 Kiel, Germany.;Johannes Gutenberg Univ Mainz, Inst Phys, D-55128 Mainz, Germany..
Univ Iceland, Sci Inst, Sch Engn & Nat Sci, IS-107 Reykjavik, Iceland.;Univ ITMO, St Petersburg 197101, Russia..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. KTH Royal Inst Technol, Dept Appl Phys, Sch Engn Sci, Electrum 229, SE-16440 Kista, Sweden..
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2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 12299Article in journal (Refereed) Published
Abstract [en]

Skyrmions are localized, topologically non-trivial spin structures which have raised high hopes for future spintronic applications. A key issue is skyrmion stability with respect to annihilation into the ferromagnetic state. Energy barriers for this collapse have been calculated taking only nearest neighbor exchange interactions into account. Here, we demonstrate that exchange frustration can greatly enhance skyrmion stability. We focus on the prototypical film system Pd/Fe/Ir(111) and use an atomistic spin model parametrized from first-principles calculations. We show that energy barriers and critical fields of skyrmion collapse as well as skyrmion lifetimes are drastically enhanced due to frustrated exchange and that antiskyrmions are metastable. In contrast an effective nearest-neighbor exchange model can only account for equilibrium properties of skyrmions such as their magnetic field dependent profile or the zero temperature phase diagram. Our work shows that frustration of long range exchange interactions -a typical feature in itinerant electron magnets -is a route towards enhanced skyrmion stability even in systems with a ferromagnetic ground state.

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Nature Publishing Group, 2017. Vol. 7, article id 12299
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Cancer and Oncology
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URN: urn:nbn:se:uu:diva-336476DOI: 10.1038/s41598-017-12525-xISI: 000411677500003PubMedID: 28951587OAI: oai:DiVA.org:uu-336476DiVA, id: diva2:1168367
Available from: 2017-12-20 Created: 2017-12-20 Last updated: 2017-12-20Bibliographically approved

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