Micromagnetic modeling of magnetic domain walls in curved cylindrical nanotubes and nanowires

Author(s)
L. Skoric, C. Donnelly, C. Abert, A. Hierro-Rodriguez, D. Suess, A. Fernández-Pacheco
Abstract

We investigate the effect of curvature on the energy and stability of domain wall configurations in curved cylindrical nanotubes and nanowires. We use micromagnetic simulations to calculate the phase diagram for the transverse wall (TW) and vortex wall (VW) states in tubes, finding the lower energy configuration and the metastability region where both types of walls can exist. The introduction of curvature shifts the range for which the TW is the ground state domain wall to higher diameters and increases the range of metastability. We interpret this behavior to be primarily due to the curvature-induced effective Dzyaloshinskii-Moriya term in the exchange energy. Furthermore, we demonstrate qualitatively the same behavior in solid cylindrical nanowires. Comparing both tubes and wires, we observe how while in tubes curvature tends to suppress the transformation from the TW to VW, in wires it promotes the transformation of the VW containing the Bloch point into the TW. These findings have important implications in the fundamental understanding of domain walls in 3D geometries and the design of future domain wall devices.

Organisation(s)
Research Platform MMM Mathematics-Magnetism-Materials, Physics of Functional Materials
External organisation(s)
University of Glasgow, Universidad de Oviedo, University of Cambridge
Journal
Applied Physics Letters
Volume
118
No. of pages
6
ISSN
0003-6951
DOI
https://doi.org/10.1063/5.0050872
Publication date
06-2021
Peer reviewed
Yes
Austrian Fields of Science 2012
103017 Magnetism
ASJC Scopus subject areas
Physics and Astronomy (miscellaneous)
Portal url
https://ucris.univie.ac.at/portal/en/publications/micromagnetic-modeling-of-magnetic-domain-walls-in-curved-cylindrical-nanotubes-and-nanowires(8a10d9cb-65c7-43e7-9800-836e02ca7cc0).html