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Ground state search, hysteretic behaviour, and reversal mechanism of skyrmionic textures in confined helimagnetic nanostructures

Ground state search, hysteretic behaviour, and reversal mechanism of skyrmionic textures in confined helimagnetic nanostructures
Ground state search, hysteretic behaviour, and reversal mechanism of skyrmionic textures in confined helimagnetic nanostructures
Magnetic skyrmions have the potential to provide solutions for low-power, high-density data storage and processing. One of the major challenges in developing skyrmion-based devices is the skyrmions’ magnetic stability in confined helimagnetic nanostructures. Through a systematic study of equilibrium states, using a full three-dimensional micromagnetic model including demagnetisation effects, we demonstrate that skyrmionic textures are the lowest energy states in helimagnetic thin film nanostructures at zero external magnetic field and in absence of magnetocrystalline anisotropy. We also report the regions of metastability for non-ground state equilibrium configurations. We show that bistable skyrmionic textures undergo hysteretic behaviour between two energetically equivalent skyrmionic states with different core orientation, even in absence of both magnetocrystalline and demagnetisation-based shape anisotropies, suggesting the existence of Dzyaloshinskii-Moriya-based shape anisotropy. Finally, we show that the skyrmionic texture core reversal dynamics is facilitated by the Bloch point occurrence and propagation.
computational nanotechnology, engineering, magnetic properties and materials, nanoscience and technology
1-14
Beg, Marijan
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Carey, Rebecca
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Wang, Weiwei
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Cortes, David
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Vousden, Mark
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Bisotti, Marc-Antonio
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Albert, Maximilian
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Chernyshenko, Dmitri
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Hovorka, Ondrej
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Stamps, Robert L.
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Fangohr, Hans
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Beg, Marijan
499a2633-2ab7-4ec3-ab2a-c6eae1874f83
Carey, Rebecca
fc5ef402-befe-4fff-ad14-c192eed54f36
Wang, Weiwei
42981e5f-b7ee-44f7-a64d-d47ab0cacbce
Cortes, David
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Vousden, Mark
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Bisotti, Marc-Antonio
be2d7abd-afdc-4d18-a2e9-a633d73a67b9
Albert, Maximilian
a8049610-1e98-4cfb-b59a-177645a42b47
Chernyshenko, Dmitri
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Hovorka, Ondrej
a12bd550-ad45-4963-aa26-dd81dd1609ee
Stamps, Robert L.
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Fangohr, Hans
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Beg, Marijan, Carey, Rebecca, Wang, Weiwei, Cortes, David, Vousden, Mark, Bisotti, Marc-Antonio, Albert, Maximilian, Chernyshenko, Dmitri, Hovorka, Ondrej, Stamps, Robert L. and Fangohr, Hans (2015) Ground state search, hysteretic behaviour, and reversal mechanism of skyrmionic textures in confined helimagnetic nanostructures. Scientific Reports, 5 (17137), 1-14. (doi:10.1038/srep17137).

Record type: Article

Abstract

Magnetic skyrmions have the potential to provide solutions for low-power, high-density data storage and processing. One of the major challenges in developing skyrmion-based devices is the skyrmions’ magnetic stability in confined helimagnetic nanostructures. Through a systematic study of equilibrium states, using a full three-dimensional micromagnetic model including demagnetisation effects, we demonstrate that skyrmionic textures are the lowest energy states in helimagnetic thin film nanostructures at zero external magnetic field and in absence of magnetocrystalline anisotropy. We also report the regions of metastability for non-ground state equilibrium configurations. We show that bistable skyrmionic textures undergo hysteretic behaviour between two energetically equivalent skyrmionic states with different core orientation, even in absence of both magnetocrystalline and demagnetisation-based shape anisotropies, suggesting the existence of Dzyaloshinskii-Moriya-based shape anisotropy. Finally, we show that the skyrmionic texture core reversal dynamics is facilitated by the Bloch point occurrence and propagation.

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More information

Accepted/In Press date: 22 October 2015
e-pub ahead of print date: 25 November 2015
Published date: 2015
Keywords: computational nanotechnology, engineering, magnetic properties and materials, nanoscience and technology
Organisations: Computational Engineering & Design Group

Identifiers

Local EPrints ID: 384731
URI: https://eprints.soton.ac.uk/id/eprint/384731
PURE UUID: 46280d95-7359-4ec7-a45c-f2ac1ec5163c
ORCID for David Cortes: ORCID iD orcid.org/0000-0003-3799-3141

Catalogue record

Date deposited: 08 Jan 2016 15:19
Last modified: 20 Jul 2019 00:24

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Contributors

Author: Marijan Beg
Author: Rebecca Carey
Author: Weiwei Wang
Author: David Cortes ORCID iD
Author: Mark Vousden
Author: Marc-Antonio Bisotti
Author: Maximilian Albert
Author: Dmitri Chernyshenko
Author: Ondrej Hovorka
Author: Robert L. Stamps
Author: Hans Fangohr

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