The University of Southampton
University of Southampton Institutional Repository

Current-induced instability of domain walls in cylindrical nanowires

Current-induced instability of domain walls in cylindrical nanowires
Current-induced instability of domain walls in cylindrical nanowires
We study the current-driven domain wall (DW) motion in cylindrical nanowires using micromagnetic simulations by implementing the Landau–Lifshitz–Gilbert equation with nonlocal spin-transfer torque in a finite difference micromagnetic package. We find that in the presence of DW, Gaussian wave packets (spin waves) will be generated when the charge current is suddenly applied to the system. This effect is excluded when using the local spin-transfer torque. The existence of spin waves emission indicates that transverse domain walls can not move arbitrarily fast in cylindrical nanowires although they are free from the Walker limit. We establish an upper velocity limit for DW motion by analyzing the stability of Gaussian wave packets using the local spin-transfer torque. Micromagnetic simulations show that the stable region obtained by using nonlocal spin-transfer torque is smaller than that by using its local counterpart. This limitation is essential for multiple DWs since the instability of Gaussian wave packets will break the structure of multiple DWs.
0953-8984
6-11
Wang, Wei Wei
4f9a9d31-9b5b-4d32-ad7f-5e9651ed26c0
Zhang, Zhaoyang
5951d239-6a4e-41d1-a2e3-033e7696a939
Pepper, Ryan A.
82ef34fc-7e93-4f98-8f85-ff0e5113ed17
Mu, Congpu
de8c9ee4-7f6c-471f-b5de-a2830cb17fa8
Zhou, Yan
6f58c9df-eeeb-4839-8c19-570f32b56ae1
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Wang, Wei Wei
4f9a9d31-9b5b-4d32-ad7f-5e9651ed26c0
Zhang, Zhaoyang
5951d239-6a4e-41d1-a2e3-033e7696a939
Pepper, Ryan A.
82ef34fc-7e93-4f98-8f85-ff0e5113ed17
Mu, Congpu
de8c9ee4-7f6c-471f-b5de-a2830cb17fa8
Zhou, Yan
6f58c9df-eeeb-4839-8c19-570f32b56ae1
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160

Wang, Wei Wei, Zhang, Zhaoyang, Pepper, Ryan A., Mu, Congpu, Zhou, Yan and Fangohr, Hans (2017) Current-induced instability of domain walls in cylindrical nanowires. Journal of Physics: Condensed Matter, 30 (1), 6-11. (doi:10.1088/1361-648X/aa9698).

Record type: Article

Abstract

We study the current-driven domain wall (DW) motion in cylindrical nanowires using micromagnetic simulations by implementing the Landau–Lifshitz–Gilbert equation with nonlocal spin-transfer torque in a finite difference micromagnetic package. We find that in the presence of DW, Gaussian wave packets (spin waves) will be generated when the charge current is suddenly applied to the system. This effect is excluded when using the local spin-transfer torque. The existence of spin waves emission indicates that transverse domain walls can not move arbitrarily fast in cylindrical nanowires although they are free from the Walker limit. We establish an upper velocity limit for DW motion by analyzing the stability of Gaussian wave packets using the local spin-transfer torque. Micromagnetic simulations show that the stable region obtained by using nonlocal spin-transfer torque is smaller than that by using its local counterpart. This limitation is essential for multiple DWs since the instability of Gaussian wave packets will break the structure of multiple DWs.

Text
1608.04876v2 - Accepted Manuscript
Download (1MB)

More information

Accepted/In Press date: 27 October 2017
e-pub ahead of print date: 29 November 2017
Published date: 29 November 2017

Identifiers

Local EPrints ID: 417019
URI: https://eprints.soton.ac.uk/id/eprint/417019
ISSN: 0953-8984
PURE UUID: de354468-fca7-42e0-ab7d-41570853515a

Catalogue record

Date deposited: 17 Jan 2018 17:30
Last modified: 14 Mar 2019 05:19

Export record

Altmetrics

Contributors

Author: Wei Wei Wang
Author: Zhaoyang Zhang
Author: Ryan A. Pepper
Author: Congpu Mu
Author: Yan Zhou
Author: Hans Fangohr

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×