Emergent magnetic monopole dynamics in macroscopically degenerate artificial spin ice

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Article numbereaav6380
Pages (from-to)1-8
JournalScience Advances
Volume5
Issue number2
Publication statusPublished - 8 Feb 2019
MoE publication typeA1 Journal article-refereed

Researchers

Research units

  • Lawrence Berkeley National Laboratory
  • Paul Scherrer Institute
  • University of California at Santa Cruz
  • University of Innsbruck
  • University of California at Berkeley
  • Harbin Institute of Technology
  • Swiss Federal Institute of Technology Zurich

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.

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