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Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice

Title
Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice
Authors
Morley, Sophie A.Porro, Jose MariaHrabec, AlesRosamond, Mark C.Venero, Diego AlbaLinfield, Edmund H.Burnell, GavinIm, Mi-YoungFischer, PeterLangridge, SeanMarrows, Christopher H.
DGIST Authors
Morley, Sophie A.; Porro, Jose Maria; Hrabec, Ales; Rosamond, Mark C.; Venero, Diego Alba; Linfield, Edmund H.; Burnell, Gavin; Im, Mi-Young; Fischer, Peter; Langridge, Sean; Marrows, Christopher H.
Issue Date
2019-11
Citation
Scientific Reports, 9
Type
Article
Article Type
Article
Keywords
DYNAMICSCREEPCOULOMB PHASEMONOPOLES
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. © 2019, The Author(s).
URI
http://hdl.handle.net/20.500.11750/10953
DOI
10.1038/s41598-019-52460-7
Publisher
Nature Publishing Group
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