Non-stochastic switching and emergence of magnetic vortices in artificial quasicrystal spin ice

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Previous studies of artificial spin ice have been largely restricted to periodic dot lattices. Ferromagnetic switching of segments in an applied magnetic field is stochastic in periodic spin ice systems, which makes emergent phenomena, such as the formation of vortex loops, hard to control or predict. We fabricated finite, aperiodic Penrose P2 tilings as antidot lattices with fivefold rotational symmetry in permalloy thin films. Measurements of the field dependence of the static magnetization reveal reproducible knee anomalies whose number and form are temperature dependent, which suggests they mark cooperative rearrangements of the tiling magnetic texture. Our micromagnetic simulations of the P2 tiling are in good agreement with experimental magnetization data and exhibit non-stochastic magnetic switching of segments in applied field, and vortex loops that are stable over an extended field interval during magnetic reversal.

Original languageEnglish (US)
Pages (from-to)170-174
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume503
DOIs
StatePublished - Aug 15 2014

Keywords

  • Artificial spin ice
  • Ferromagnetic switching
  • Geometrical frustration
  • Magnetic vortices
  • Micromagnetic simulations
  • Quasicrystal

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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