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Skyrmion-skyrmion and skyrmion-edge repulsions in skyrmion-based racetrack memory

Skyrmion-skyrmion and skyrmion-edge repulsions in skyrmion-based racetrack memory
Skyrmion-skyrmion and skyrmion-edge repulsions in skyrmion-based racetrack memory
Magnetic skyrmions are promising for building next-generation magnetic memories and spintronic devices due to their stability, small size and the extremely low currents needed to move them. In particular, skyrmion-based racetrack memory is attractive for information technology, where skyrmions are used to store information as data bits instead of traditional domain walls. Here we numerically demonstrate the impacts of skyrmion-skyrmion and skyrmion-edge repulsions on the feasibility of skyrmion-based racetrack memory. The reliable and practicable spacing between consecutive skyrmionic bits on the racetrack as well as the ability to adjust it are investigated. Clogging of skyrmionic bits is found at the end of the racetrack, leading to the reduction of skyrmion size. Further, we demonstrate an effective and simple method to avoid the clogging of skyrmionic bits, which ensures the elimination of skyrmionic bits beyond the reading element. Our results give guidance for the design and development of future skyrmion-based racetrack memory.
2045-2322
1-15
Zhang, Xichao
d1c62ad8-1482-42f6-829f-38538cca4a2b
Zhao, G.P.
4cf88307-232d-4f9b-ab08-cebf0a6e910c
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Liu, Ping
41ff5c8a-4b8a-4010-b1a9-eb6d03716591
Xia, W.X.
537f5261-52f5-4e65-bcc8-c0ffb49ac03a
Xia, J
db3e1421-3937-41a7-866a-5aadcf0628b9
Morvan, F.J.
b3513655-f828-4d94-8ae3-f49695f4b64a
Zhang, Xichao
d1c62ad8-1482-42f6-829f-38538cca4a2b
Zhao, G.P.
4cf88307-232d-4f9b-ab08-cebf0a6e910c
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Liu, Ping
41ff5c8a-4b8a-4010-b1a9-eb6d03716591
Xia, W.X.
537f5261-52f5-4e65-bcc8-c0ffb49ac03a
Xia, J
db3e1421-3937-41a7-866a-5aadcf0628b9
Morvan, F.J.
b3513655-f828-4d94-8ae3-f49695f4b64a

Zhang, Xichao, Zhao, G.P., Fangohr, Hans, Liu, Ping, Xia, W.X., Xia, J and Morvan, F.J. (2015) Skyrmion-skyrmion and skyrmion-edge repulsions in skyrmion-based racetrack memory. Scientific Reports, 5, 1-15. (doi:10.1038/srep07643).

Record type: Article

Abstract

Magnetic skyrmions are promising for building next-generation magnetic memories and spintronic devices due to their stability, small size and the extremely low currents needed to move them. In particular, skyrmion-based racetrack memory is attractive for information technology, where skyrmions are used to store information as data bits instead of traditional domain walls. Here we numerically demonstrate the impacts of skyrmion-skyrmion and skyrmion-edge repulsions on the feasibility of skyrmion-based racetrack memory. The reliable and practicable spacing between consecutive skyrmionic bits on the racetrack as well as the ability to adjust it are investigated. Clogging of skyrmionic bits is found at the end of the racetrack, leading to the reduction of skyrmion size. Further, we demonstrate an effective and simple method to avoid the clogging of skyrmionic bits, which ensures the elimination of skyrmionic bits beyond the reading element. Our results give guidance for the design and development of future skyrmion-based racetrack memory.

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More information

Accepted/In Press date: 3 December 2014
Published date: 6 January 2015
Organisations: Computational Engineering & Design Group

Identifiers

Local EPrints ID: 374129
URI: https://eprints.soton.ac.uk/id/eprint/374129
ISSN: 2045-2322
PURE UUID: 84da5fbe-7621-4014-8bef-f6654dd0d145

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Date deposited: 06 Feb 2015 16:44
Last modified: 29 Nov 2018 17:32

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