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Magnetic charge propagation upon a 3D artificial spin-ice

May, A., Saccone, M., Van Den Berg, A., Askey, J., Hunt, M. and Ladak, S. 2021. Magnetic charge propagation upon a 3D artificial spin-ice. Nature Communications 12 , 3217. 10.1038/s41467-021-23480-7

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Abstract

Magnetic charge propagation in spin-ice materials has yielded a paradigm-shift in science, allowing the symmetry between electricity and magnetism to be studied. Recent work is now suggesting the spin-ice surface may be important in mediating the ordering and associated phase space in such materials. Here, we detail a 3D artificial spin-ice, which captures the exact geometry of bulk systems, allowing magnetic charge dynamics to be directly visualized upon the surface. Using magnetic force microscopy, we observe vastly different magnetic charge dynamics along two principal directions. For a field applied along the surface termi- nation, local energetics force magnetic charges to nucleate over a larger characteristic dis- tance, reducing their magnetic Coulomb interaction and producing uncorrelated monopoles. In contrast, applying a field transverse to the surface termination yields highly correlated monopole-antimonopole pairs. Detailed simulations suggest it is the difference in effective chemical potential as well as the energy landscape experienced during dynamics that yields the striking differences in monopole transport.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Additional Information: This article is licensed under a Creative Commons Attribution 4.0 International License
Publisher: Nature Research
ISSN: 2041-1723
Funders: EPSRC
Date of First Compliant Deposit: 1 June 2021
Date of Acceptance: 30 April 2021
Last Modified: 11 Jun 2021 10:27
URI: http://orca.cardiff.ac.uk/id/eprint/141637

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