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Thermal stability and topological protection of skyrmions in nanotracks

Thermal stability and topological protection of skyrmions in nanotracks
Thermal stability and topological protection of skyrmions in nanotracks
Magnetic skyrmions are hailed as a potential technology for data storage and other data processing devices. However, their stability against thermal fluctuations is an open question that must be answered before skyrmion-based devices can be designed. In this work, we study paths in the energy landscape via which the transition between the skyrmion and the uniform state can occur in interfacial Dzyaloshinskii-Moriya finite-sized systems. We find three mechanisms the system can take in the process of skyrmion nucleation or destruction and identify that the transition facilitated by the boundary has a significantly lower energy barrier than the other energy paths. This clearly demonstrates the lack of the skyrmion topological protection in finite-sized magnetic systems. Overall, the energy barriers of the system under investigation are too small for storage applications at room temperature, but research into device materials, geometry and design may be able to address this.
ferromagnetism, skyrmions, energy barrier , thermal stability, magnetism
2045-2322
Cortes, David
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Wang, Weiwei
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Beg, Marijan
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Pepper, Ryan
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Bisotti, Marc-Antonio
be2d7abd-afdc-4d18-a2e9-a633d73a67b9
Carey, Rebecca
fc5ef402-befe-4fff-ad14-c192eed54f36
Vousden, Mark
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Kluyver, Thomas
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Hovorka, Ondrej
a12bd550-ad45-4963-aa26-dd81dd1609ee
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Cortes, David
97d026d6-1083-4edf-8ba6-2f66a3e15033
Wang, Weiwei
42981e5f-b7ee-44f7-a64d-d47ab0cacbce
Beg, Marijan
499a2633-2ab7-4ec3-ab2a-c6eae1874f83
Pepper, Ryan
82ef34fc-7e93-4f98-8f85-ff0e5113ed17
Bisotti, Marc-Antonio
be2d7abd-afdc-4d18-a2e9-a633d73a67b9
Carey, Rebecca
fc5ef402-befe-4fff-ad14-c192eed54f36
Vousden, Mark
d45312dd-a46f-4376-89f4-38b1ac8957c9
Kluyver, Thomas
d3bd4245-1a99-4268-b34f-8f9f0153465e
Hovorka, Ondrej
a12bd550-ad45-4963-aa26-dd81dd1609ee
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160

Cortes, David, Wang, Weiwei, Beg, Marijan, Pepper, Ryan, Bisotti, Marc-Antonio, Carey, Rebecca, Vousden, Mark, Kluyver, Thomas, Hovorka, Ondrej and Fangohr, Hans (2017) Thermal stability and topological protection of skyrmions in nanotracks. Scientific Reports, 7. (doi:10.1038/s41598-017-03391-8).

Record type: Article

Abstract

Magnetic skyrmions are hailed as a potential technology for data storage and other data processing devices. However, their stability against thermal fluctuations is an open question that must be answered before skyrmion-based devices can be designed. In this work, we study paths in the energy landscape via which the transition between the skyrmion and the uniform state can occur in interfacial Dzyaloshinskii-Moriya finite-sized systems. We find three mechanisms the system can take in the process of skyrmion nucleation or destruction and identify that the transition facilitated by the boundary has a significantly lower energy barrier than the other energy paths. This clearly demonstrates the lack of the skyrmion topological protection in finite-sized magnetic systems. Overall, the energy barriers of the system under investigation are too small for storage applications at room temperature, but research into device materials, geometry and design may be able to address this.

Text
Rushton 2016 New J. Phys. 18_113020 - Version of Record
Available under License Creative Commons Attribution.
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Submitted date: 4 January 2017
Accepted/In Press date: 19 April 2017
e-pub ahead of print date: 22 June 2017
Published date: 22 June 2017
Keywords: ferromagnetism, skyrmions, energy barrier , thermal stability, magnetism
Organisations: Electronics & Computer Science, Computational Engineering & Design Group, Faculty of Engineering and the Environment, Education Hub

Identifiers

Local EPrints ID: 411882
URI: https://eprints.soton.ac.uk/id/eprint/411882
ISSN: 2045-2322
PURE UUID: 87e1ad75-4a41-446e-999e-beea8012dc02
ORCID for David Cortes: ORCID iD orcid.org/0000-0003-3799-3141
ORCID for Thomas Kluyver: ORCID iD orcid.org/0000-0003-4020-6364

Catalogue record

Date deposited: 28 Jun 2017 16:31
Last modified: 14 Mar 2019 01:24

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Contributors

Author: David Cortes ORCID iD
Author: Weiwei Wang
Author: Marijan Beg
Author: Ryan Pepper
Author: Marc-Antonio Bisotti
Author: Rebecca Carey
Author: Mark Vousden
Author: Thomas Kluyver ORCID iD
Author: Ondrej Hovorka
Author: Hans Fangohr

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