Effects of interlayer exchange on collapse mechanisms and stability of magnetic skyrmions
Post-print / Lokaútgáfa höfundar Theoretical calculations of thermally activated decay of skyrmions in systems comprising several magnetic monolayers are presented, with a special focus on bilayer systems. Mechanisms of skyrmion collapse are identified and corresponding energy barriers and thermal c...
Published in: | Physical Review B |
---|---|
Main Authors: | , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Physical Society (APS)
2022
|
Subjects: | |
Online Access: | https://hdl.handle.net/20.500.11815/2915 https://doi.org/10.1103/PhysRevB.105.014414 |
id |
ftopinvisindi:oai:opinvisindi.is:20.500.11815/2915 |
---|---|
record_format |
openpolar |
spelling |
ftopinvisindi:oai:opinvisindi.is:20.500.11815/2915 2023-05-15T16:52:07+02:00 Effects of interlayer exchange on collapse mechanisms and stability of magnetic skyrmions Schrautzer, Hendrik von Malottki, Stephan Heinze, Stefan Bessarab, Pavel Raunvísindastofnun (HÍ) Science Institute (UI) Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) Háskóli Íslands University of Iceland 2022-01-11 014414 https://hdl.handle.net/20.500.11815/2915 https://doi.org/10.1103/PhysRevB.105.014414 en eng American Physical Society (APS) Physical Review B;105 (1) H. Schrautzer, S. von Malottki, P. F. Bessarab, & Stefan Heinze (2022). Effects of interlayer exchange on collapse mechanisms and stability of magnetic skyrmions. Physical Review B 105, 014414. doi:10.1103/PhysRevB.105.014414 2469-9950 2469-9969 (eISSN) https://hdl.handle.net/20.500.11815/2915 Physical Review B doi:10.1103/PhysRevB.105.014414 info:eu-repo/semantics/openAccess Eðlisfræði exchange bias frustrated magnetism skyrmions bilayer films multilayer thin films noncollinear magnets Heisenberg model Atómfræði info:eu-repo/semantics/article 2022 ftopinvisindi https://doi.org/20.500.11815/2915 https://doi.org/10.1103/PhysRevB.105.014414 2022-11-18T06:52:16Z Post-print / Lokaútgáfa höfundar Theoretical calculations of thermally activated decay of skyrmions in systems comprising several magnetic monolayers are presented, with a special focus on bilayer systems. Mechanisms of skyrmion collapse are identified and corresponding energy barriers and thermal collapse rates are evaluated as functions of the interlayer exchange coupling and mutual stacking of the monolayers using transition state theory and an atomistic spin Hamiltonian. In order to contrast the results to monolayer systems, the magnetic interactions within each layer are chosen so as to mimic the well-established Pd/Fe/Ir(111) system. Even bilayer systems demonstrate a rich diversity of skyrmion collapse mechanisms that sometimes coexist. For very weakly coupled layers, the skyrmions in each layer decay successively via radially symmetric shrinking. Slightly larger coupling leads to an asymmetric chimera collapse stabilized by the interlayer exchange. When the interlayer exchange coupling reaches a certain critical value, the skyrmions collapse simultaneously. Interestingly, the overall energy barrier for the skyrmion collapse does not always converge to a multiple of that for a monolayer system in the strongly coupled regime. For a certain stacking of the magnetic layers, the energy barrier as a function of the interlayer exchange coupling features a maximum and then decreases with the coupling strength in the strong coupling regime. Calculated mechanisms of skyrmion collapse are used to ultimately predict the skyrmion lifetime. Our results reveal a comprehensive picture of the thermal stability of skyrmions in magnetic multilayers and provide a perspective for realizing skyrmions with controlled properties. We gratefully acknowledge financial support from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via project no. 414321830 (HE3292/11-1) and no. 418425860 (HE3292/13-1), the Icelandic Research Fund (Grant No. 217750 and 184949), the University of Iceland Research Fund and the ... Article in Journal/Newspaper Iceland Opin vísindi (Iceland) Physical Review B 105 1 |
institution |
Open Polar |
collection |
Opin vísindi (Iceland) |
op_collection_id |
ftopinvisindi |
language |
English |
topic |
Eðlisfræði exchange bias frustrated magnetism skyrmions bilayer films multilayer thin films noncollinear magnets Heisenberg model Atómfræði |
spellingShingle |
Eðlisfræði exchange bias frustrated magnetism skyrmions bilayer films multilayer thin films noncollinear magnets Heisenberg model Atómfræði Schrautzer, Hendrik von Malottki, Stephan Heinze, Stefan Bessarab, Pavel Effects of interlayer exchange on collapse mechanisms and stability of magnetic skyrmions |
topic_facet |
Eðlisfræði exchange bias frustrated magnetism skyrmions bilayer films multilayer thin films noncollinear magnets Heisenberg model Atómfræði |
description |
Post-print / Lokaútgáfa höfundar Theoretical calculations of thermally activated decay of skyrmions in systems comprising several magnetic monolayers are presented, with a special focus on bilayer systems. Mechanisms of skyrmion collapse are identified and corresponding energy barriers and thermal collapse rates are evaluated as functions of the interlayer exchange coupling and mutual stacking of the monolayers using transition state theory and an atomistic spin Hamiltonian. In order to contrast the results to monolayer systems, the magnetic interactions within each layer are chosen so as to mimic the well-established Pd/Fe/Ir(111) system. Even bilayer systems demonstrate a rich diversity of skyrmion collapse mechanisms that sometimes coexist. For very weakly coupled layers, the skyrmions in each layer decay successively via radially symmetric shrinking. Slightly larger coupling leads to an asymmetric chimera collapse stabilized by the interlayer exchange. When the interlayer exchange coupling reaches a certain critical value, the skyrmions collapse simultaneously. Interestingly, the overall energy barrier for the skyrmion collapse does not always converge to a multiple of that for a monolayer system in the strongly coupled regime. For a certain stacking of the magnetic layers, the energy barrier as a function of the interlayer exchange coupling features a maximum and then decreases with the coupling strength in the strong coupling regime. Calculated mechanisms of skyrmion collapse are used to ultimately predict the skyrmion lifetime. Our results reveal a comprehensive picture of the thermal stability of skyrmions in magnetic multilayers and provide a perspective for realizing skyrmions with controlled properties. We gratefully acknowledge financial support from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via project no. 414321830 (HE3292/11-1) and no. 418425860 (HE3292/13-1), the Icelandic Research Fund (Grant No. 217750 and 184949), the University of Iceland Research Fund and the ... |
author2 |
Raunvísindastofnun (HÍ) Science Institute (UI) Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) Háskóli Íslands University of Iceland |
format |
Article in Journal/Newspaper |
author |
Schrautzer, Hendrik von Malottki, Stephan Heinze, Stefan Bessarab, Pavel |
author_facet |
Schrautzer, Hendrik von Malottki, Stephan Heinze, Stefan Bessarab, Pavel |
author_sort |
Schrautzer, Hendrik |
title |
Effects of interlayer exchange on collapse mechanisms and stability of magnetic skyrmions |
title_short |
Effects of interlayer exchange on collapse mechanisms and stability of magnetic skyrmions |
title_full |
Effects of interlayer exchange on collapse mechanisms and stability of magnetic skyrmions |
title_fullStr |
Effects of interlayer exchange on collapse mechanisms and stability of magnetic skyrmions |
title_full_unstemmed |
Effects of interlayer exchange on collapse mechanisms and stability of magnetic skyrmions |
title_sort |
effects of interlayer exchange on collapse mechanisms and stability of magnetic skyrmions |
publisher |
American Physical Society (APS) |
publishDate |
2022 |
url |
https://hdl.handle.net/20.500.11815/2915 https://doi.org/10.1103/PhysRevB.105.014414 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Physical Review B;105 (1) H. Schrautzer, S. von Malottki, P. F. Bessarab, & Stefan Heinze (2022). Effects of interlayer exchange on collapse mechanisms and stability of magnetic skyrmions. Physical Review B 105, 014414. doi:10.1103/PhysRevB.105.014414 2469-9950 2469-9969 (eISSN) https://hdl.handle.net/20.500.11815/2915 Physical Review B doi:10.1103/PhysRevB.105.014414 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/20.500.11815/2915 https://doi.org/10.1103/PhysRevB.105.014414 |
container_title |
Physical Review B |
container_volume |
105 |
container_issue |
1 |
_version_ |
1766042267408138240 |