Emergent magnetic monopole dynamics in macroscopically degenerate artificial spin ice

Alan Farhan*, Michael Saccone, Charlotte F. Petersen, Scott Dhuey, Rajesh V. Chopdekar, Yen Lin Huang, Noah Kent, Zuhuang Chen, Mikko J. Alava, Thomas Lippert, Andreas Scholl, Sebastiaan van Dijken


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106 引文 斯高帕斯(Scopus)


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.

期刊Science Advances
出版狀態Published - 8 2月 2019


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