Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices

Abstract Magnetic skyrmions are whirl-like nano-objects with topological protection. When driven by direct currents, skyrmions move but experience a transverse deflection. This so-called skyrmion Hall effect is often regarded a drawback for memory applications. Herein, we show that this unique effec...

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Autores principales:	Börge Göbel, Ingrid Mertig
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2102272a79be4f21a90c89f020c7a313
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id	oai:doaj.org-article:2102272a79be4f21a90c89f020c7a313
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spelling	oai:doaj.org-article:2102272a79be4f21a90c89f020c7a3132021-12-02T10:44:21ZSkyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices10.1038/s41598-021-81992-02045-2322https://doaj.org/article/2102272a79be4f21a90c89f020c7a3132021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81992-0https://doaj.org/toc/2045-2322Abstract Magnetic skyrmions are whirl-like nano-objects with topological protection. When driven by direct currents, skyrmions move but experience a transverse deflection. This so-called skyrmion Hall effect is often regarded a drawback for memory applications. Herein, we show that this unique effect can also be favorable for spintronic applications: We show that in a racetrack with a broken inversion symmetry, the skyrmion Hall effect allows to translate an alternating current into a directed motion along the track, like in a ratchet. We analyze several modes of the ratchet mechanism and show that it is unique for topological magnetic whirls. We elaborate on the fundamental differences compared to the motion of topologically trivial magnetic objects, as well as classical particles driven by periodic forces. Depending on the exact racetrack geometry, the ratchet mechanism can be soft or strict. In the latter case, the skyrmion propagates close to the efficiency maximum.Börge GöbelIngrid MertigNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Börge Göbel Ingrid Mertig Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices
description	Abstract Magnetic skyrmions are whirl-like nano-objects with topological protection. When driven by direct currents, skyrmions move but experience a transverse deflection. This so-called skyrmion Hall effect is often regarded a drawback for memory applications. Herein, we show that this unique effect can also be favorable for spintronic applications: We show that in a racetrack with a broken inversion symmetry, the skyrmion Hall effect allows to translate an alternating current into a directed motion along the track, like in a ratchet. We analyze several modes of the ratchet mechanism and show that it is unique for topological magnetic whirls. We elaborate on the fundamental differences compared to the motion of topologically trivial magnetic objects, as well as classical particles driven by periodic forces. Depending on the exact racetrack geometry, the ratchet mechanism can be soft or strict. In the latter case, the skyrmion propagates close to the efficiency maximum.
format	article
author	Börge Göbel Ingrid Mertig
author_facet	Börge Göbel Ingrid Mertig
author_sort	Börge Göbel
title	Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices
title_short	Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices
title_full	Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices
title_fullStr	Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices
title_full_unstemmed	Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices
title_sort	skyrmion ratchet propagation: utilizing the skyrmion hall effect in ac racetrack storage devices
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/2102272a79be4f21a90c89f020c7a313
work_keys_str_mv	AT borgegobel skyrmionratchetpropagationutilizingtheskyrmionhalleffectinacracetrackstoragedevices AT ingridmertig skyrmionratchetpropagationutilizingtheskyrmionhalleffectinacracetrackstoragedevices
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Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices

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