Nonstochastic magnetic reversal in artificial quasicrystalline spin ice

B. Farmer, V. S. Bhat, J. Sklenar, J. Woods, E. Teipel, N. Smith, J. B. Ketterson, J. T. Hastings, L. E. De Long*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We have measured the isothermal DC magnetization of Penrose P2 tilings (P2T) composed of wire segments of permalloy thin film. Micromagnetic simulations reproduce the coercive fields and "knee anomalies" observed in experimental data and show magnetic shape anisotropy constrains segments to be single-domain (Ising spins) at low fields, similar to artificial spin ice (ASI). Mirror symmetry controls the initial reversal of individual segments oriented parallel to the applied field, followed by complex switching of multiple adjacent segments ("avalanches") of various orientations such that closed magnetization loops ("vortices") are favored. Ferromagnetic P2T differ from previously studied ASI systems due to their aperiodic translational symmetry and numerous inequivalent pattern vertices, which drive nonstochastic switching of segment polarizations.

Original languageEnglish (US)
Article number17E133
JournalJournal of Applied Physics
Volume115
Issue number17
DOIs
StatePublished - May 7 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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