Emergent magnetic monopole dynamics in macroscopically degenerate artificial spin ice
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2019-02-08
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Language
en
Pages
1-8
Series
Science Advances, Volume 5, issue 2
Abstract
Magnetic monopoles, proposed as elementary particles that act as isolated magnetic south and north poles, have long attracted research interest as magnetic analogs to electric charge. In solid-state physics, a classical analog to these elusive particles has emerged as topological excitations within pyrochlore spin ice systems. We present the first real-time imaging of emergent magnetic monopole motion in a macroscopically degenerate artificial spin ice system consisting of thermally activated Ising-type nanomagnets lithographically arranged onto a pre-etched silicon substrate. A real-space characterization of emergent magnetic monopoles within the framework of Debye-Hückel theory is performed, providing visual evidence that these topological defects act like a plasma of Coulomb-type magnetic charges. In contrast to vertex defects in a purely two-dimensional artificial square ice, magnetic monopoles are free to evolve within a divergence-free vacuum, a magnetic Coulomb phase, for which features in the form of pinch-point singularities in magnetic structure factors are observed.Description
Keywords
MAGNETIC MONOPOLES, spin ice, nanomagnetism, XMCD
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Citation
Farhan, A, Saccone, M, Petersen, C F, Dhuey, S, Chopdekar, R V, Huang, Y L, Kent, N, Chen, Z, Alava, M J, Lippert, T, Scholl, A & van Dijken, S 2019, ' Emergent magnetic monopole dynamics in macroscopically degenerate artificial spin ice ', Science Advances, vol. 5, no. 2, eaav6380, pp. 1-8 . https://doi.org/10.1126/sciadv.aav6380
