Magnetic reversal modes in cylindrical nanostructures: from disks to wires

Abstract Cylindrical magnetic nanowires are key elements of fast-recording and high-density 3D-storage devices. The accurate tuning of the magnetization processes at the nanoscale is crucial for the development of future nano-devices. Here, we analyzed the magnetization of Ni nanostructures with 15–...

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Autores principales:	Mariana P. Proenca, Javier Rial, Joao P. Araujo, Celia T. Sousa
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a456cead0aeb4f4fba418ba375b32f7b
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spelling	oai:doaj.org-article:a456cead0aeb4f4fba418ba375b32f7b2021-12-02T15:54:50ZMagnetic reversal modes in cylindrical nanostructures: from disks to wires10.1038/s41598-021-89474-z2045-2322https://doaj.org/article/a456cead0aeb4f4fba418ba375b32f7b2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89474-zhttps://doaj.org/toc/2045-2322Abstract Cylindrical magnetic nanowires are key elements of fast-recording and high-density 3D-storage devices. The accurate tuning of the magnetization processes at the nanoscale is crucial for the development of future nano-devices. Here, we analyzed the magnetization of Ni nanostructures with 15–100 nm in diameter and 12–230 nm in length and compared our results with experimental data for periodic arrays. Our modelling led to a phase diagram of the reversal modes where the presence of a critical diameter (d ≈ 30 nm) triggered the type of domain wall (DW) formed (transverse or vortex); while a critical length (L ≈ 100 nm) determined the number of DWs nucleated. Moreover, vortex-DWs originated from 3D skyrmion tubes, reported as one of the best configurations for storage devices. By increasing the diameter and aspect-ratio of nanowires with L > 100 nm, three reversal modes were observed: simultaneous propagation of two vortex-DWs; propagation of one vortex-DW; or spiral rotation of both DWs through “corkscrew” mechanism. Only for very low aspect-ratios (nanodisks), no skyrmion tubes were observed and reversal occurred by spiral rotation of one vortex-DW. The broad range of nanostructures studied allowed the creation of a complete phase diagram, highly important for future choice of nanoscaled dimensions in the development of novel nano-devices.Mariana P. ProencaJavier RialJoao P. AraujoCelia T. SousaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mariana P. Proenca Javier Rial Joao P. Araujo Celia T. Sousa Magnetic reversal modes in cylindrical nanostructures: from disks to wires
description	Abstract Cylindrical magnetic nanowires are key elements of fast-recording and high-density 3D-storage devices. The accurate tuning of the magnetization processes at the nanoscale is crucial for the development of future nano-devices. Here, we analyzed the magnetization of Ni nanostructures with 15–100 nm in diameter and 12–230 nm in length and compared our results with experimental data for periodic arrays. Our modelling led to a phase diagram of the reversal modes where the presence of a critical diameter (d ≈ 30 nm) triggered the type of domain wall (DW) formed (transverse or vortex); while a critical length (L ≈ 100 nm) determined the number of DWs nucleated. Moreover, vortex-DWs originated from 3D skyrmion tubes, reported as one of the best configurations for storage devices. By increasing the diameter and aspect-ratio of nanowires with L > 100 nm, three reversal modes were observed: simultaneous propagation of two vortex-DWs; propagation of one vortex-DW; or spiral rotation of both DWs through “corkscrew” mechanism. Only for very low aspect-ratios (nanodisks), no skyrmion tubes were observed and reversal occurred by spiral rotation of one vortex-DW. The broad range of nanostructures studied allowed the creation of a complete phase diagram, highly important for future choice of nanoscaled dimensions in the development of novel nano-devices.
format	article
author	Mariana P. Proenca Javier Rial Joao P. Araujo Celia T. Sousa
author_facet	Mariana P. Proenca Javier Rial Joao P. Araujo Celia T. Sousa
author_sort	Mariana P. Proenca
title	Magnetic reversal modes in cylindrical nanostructures: from disks to wires
title_short	Magnetic reversal modes in cylindrical nanostructures: from disks to wires
title_full	Magnetic reversal modes in cylindrical nanostructures: from disks to wires
title_fullStr	Magnetic reversal modes in cylindrical nanostructures: from disks to wires
title_full_unstemmed	Magnetic reversal modes in cylindrical nanostructures: from disks to wires
title_sort	magnetic reversal modes in cylindrical nanostructures: from disks to wires
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a456cead0aeb4f4fba418ba375b32f7b
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Magnetic reversal modes in cylindrical nanostructures: from disks to wires

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