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Effect of lithographicallyinduced strain relaxation on the magnetic domain configuration in microfabricated epitaxially grown Fe81Ga19

Beardsley, RP; Parkes, DE; Zemen, J; Bowe, S; Edmonds, KW; Reardon, C; Maccherozzi, F; ... Rushforth, AW; + view all (2017) Effect of lithographicallyinduced strain relaxation on the magnetic domain configuration in microfabricated epitaxially grown Fe81Ga19. Scientific Reports , 7 , Article 42107. 10.1038/srep42107. Green open access

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Abstract

We investigate the role of lithographically-induced strain relaxation in a micron-scaled device fabricated from epitaxial thin films of the magnetostrictive alloy Fe81Ga19. The strain relaxation due to lithographic patterning induces a magnetic anisotropy that competes with the magnetocrystalline and shape induced anisotropies to play a crucial role in stabilising a flux-closing domain pattern. We use magnetic imaging, micromagnetic calculations and linear elastic modelling to investigate a region close to the edges of an etched structure. This highly-strained edge region has a significant influence on the magnetic domain configuration due to an induced magnetic anisotropy resulting from the inverse magnetostriction effect. We investigate the competition between the strain-induced and shape-induced anisotropy energies, and the resultant stable domain configurations, as the width of the bar is reduced to the nanoscale range. Understanding this behaviour will be important when designing hybrid magneto-electric spintronic devices based on highly magnetostrictive materials.

Type: Article
Title: Effect of lithographicallyinduced strain relaxation on the magnetic domain configuration in microfabricated epitaxially grown Fe81Ga19
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/srep42107
Publisher version: http://doi.org/10.1038/srep42107
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Science & Technology, Multidisciplinary Sciences, Science & Technology - Other Topics, WALL PROPAGATION, MEMORY, DRIVEN, ALLOYS, FILMS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1544358
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