Dipolar Cairo lattice: Geometrical frustration and short-range correlations

Research output: Contribution to journalArticleScientificpeer-review


Research units

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


We have studied low-energy configurations in two-dimensional arrays consisting of Ising-type dipolar coupled nanomagnets lithographically defined onto a two-dimensional Cairo lattice, thus dubbed the dipolar Cairo lattice. Employing synchrotron-based photoemission electron microscopy (PEEM), we perform real-space imaging of moment configurations achieved after thermal annealing. These states are then characterized in terms of vertex populations, spin- and emergent magnetic charge correlations, and a topology-enforced emergent ice rule. The results reveal a strong dominance of short-range correlations and the absence of long-range order, reflecting the high degree of geometrical spin frustration present in this example of an artificial frustrated spin system.


Original languageEnglish
Article number104402
Pages (from-to)1-8
JournalPhysical Review Materials
Issue number10
Publication statusPublished - 7 Oct 2019
MoE publication typeA1 Journal article-refereed

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