Observation of robust FMR in permalloy quasiperiodic arrays

Vinayak Bhat*, J. Woods, B. Farmer, L. E. De Long, J. T. Hastings, J. Sklenar, J. B. Ketterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We have used ferromagnetic resonance (FMR) at fixed frequency 9.7 GHz to investigate permalloy thin films patterned with antidots to form a five-fold quasicrystal pattern. For DC applied fields H below 3.5 kOe, we observed robust FMR spectra exhibiting two-fold rotational symmetry instead of the five-fold symmetry expected for quasicrystals. Dynamic micromagnetic simulations of the FMR spectra performed at H=1\kOe and 12 kOe exhibit two-fold and ten-fold rotational symmetry, respectively. The ten-fold symmetry observed in simulations is consistent with a saturated state of isolated write fields. We infer the two-fold rotational symmetry observed for H=1\kOe is due to an unsaturated state of five-fold write fields closely spaced on a square lattice.

Original languageEnglish (US)
Article number6559206
Pages (from-to)3101-3104
Number of pages4
JournalIEEE Transactions on Magnetics
Volume49
Issue number7
DOIs
StatePublished - 2013

Keywords

  • Antidot arrays
  • domain walls
  • ferromagnetic resonance
  • ferromagnetic thin films
  • micromagnetic simulations
  • quasi crystals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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