Morley, SA, Porro, JM, Hrabec, A et al. (8 more authors) (2019) Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice. Scientific Reports, 9. 15989. ISSN 2045-2322
Abstract
Designing and constructing model systems that embody the statistical mechanics of frustration is now possible using nanotechnology. We have arranged nanomagnets on a two-dimensional square lattice to form an artificial spin ice, and studied its fractional excitations, emergent magnetic monopoles, and how they respond to a driving field using X-ray magnetic microscopy. We observe a regime in which the monopole drift velocity is linear in field above a critical field for the onset of motion. The temperature dependence of the critical field can be described by introducing an interaction term into the Bean-Livingston model of field-assisted barrier hopping. By analogy with electrical charge drift motion, we define and measure a monopole mobility that is larger both for higher temperatures and stronger interactions between nanomagnets. The mobility in this linear regime is described by a creep model of zero-dimensional charges moving within a network of quasi-one-dimensional objects.
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Copyright, Publisher and Additional Information: | © THe Author(s) 2019. This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) (https://creativecommons.org/licenses/by/4.0/) | ||||
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Institution: | The University of Leeds | ||||
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Condensed Matter (Leeds) |
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Depositing User: | Symplectic Publications | ||||
Date Deposited: | 07 Nov 2019 13:16 | ||||
Last Modified: | 26 Nov 2019 14:19 | ||||
Status: | Published | ||||
Publisher: | Nature Research | ||||
Identification Number: | https://doi.org/10.1038/s41598-019-52460-7 | ||||
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