Enhanced skyrmion stability due to exchange frustration

Abstract 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...

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Autores principales:	S. von Malottki, B. Dupé, P. F. Bessarab, A. Delin, S. Heinze
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ce21262c94da4d7b931b5cace1174700
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spelling	oai:doaj.org-article:ce21262c94da4d7b931b5cace11747002021-12-02T15:06:24ZEnhanced skyrmion stability due to exchange frustration10.1038/s41598-017-12525-x2045-2322https://doaj.org/article/ce21262c94da4d7b931b5cace11747002017-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-12525-xhttps://doaj.org/toc/2045-2322Abstract 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.S. von MalottkiB. DupéP. F. BessarabA. DelinS. HeinzeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q S. von Malottki B. Dupé P. F. Bessarab A. Delin S. Heinze Enhanced skyrmion stability due to exchange frustration
description	Abstract 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.
format	article
author	S. von Malottki B. Dupé P. F. Bessarab A. Delin S. Heinze
author_facet	S. von Malottki B. Dupé P. F. Bessarab A. Delin S. Heinze
author_sort	S. von Malottki
title	Enhanced skyrmion stability due to exchange frustration
title_short	Enhanced skyrmion stability due to exchange frustration
title_full	Enhanced skyrmion stability due to exchange frustration
title_fullStr	Enhanced skyrmion stability due to exchange frustration
title_full_unstemmed	Enhanced skyrmion stability due to exchange frustration
title_sort	enhanced skyrmion stability due to exchange frustration
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/ce21262c94da4d7b931b5cace1174700
work_keys_str_mv	AT svonmalottki enhancedskyrmionstabilityduetoexchangefrustration AT bdupe enhancedskyrmionstabilityduetoexchangefrustration AT pfbessarab enhancedskyrmionstabilityduetoexchangefrustration AT adelin enhancedskyrmionstabilityduetoexchangefrustration AT sheinze enhancedskyrmionstabilityduetoexchangefrustration
_version_	1718388480207224832

Enhanced skyrmion stability due to exchange frustration

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