Imaging Magnetic Order and Frustration on Distinct Sublattices in Artificial Quasicrystals

POSTER

Abstract

Scanning electron microscopy with polarization analysis (SEMPA) was used to acquire direct images of as-grown magnetization textures for Permalloy thin films patterned into Penrose P2 tilings (P2T). Simulations yield a low-energy manifold of textures composed of two distinct, perfectly ordered sublattices and two sublattices that remain frustrated. As-grown P2T samples exhibited large domains of the two ordered sublattices in the room-temperature SEMPA images. Higher resolution Monte Carlo simulations based on long-range dipolar interactions predict the two frustrated sublattices will order. These results indicate 3$^{\mathrm{rd}}$ generation P2T will offer the first example of magnetic order in a quasicrystalline material.

*Research at University of Kentucky supported by U.S. Department of Energy grant no. DE-FG02-97ER-45653, and U.S. National Science Foundation grant no. DMR-1506979.

Authors

  • Barry Farmer

    • Department of Physics and Astronomy, University of Kentucky
    • Univ of Kentucky

  • Andrew Balk

    • National Institute of Standards and Technology
    • Center for Nanoscale Science and Technology, National Institute of Standards and Technology. Maryland Nanocenter, University of Maryland

  • Vinayaka Bhat

    • Technical University of Munich

  • Eric Teipel

    • Department of Physics and Astronomy, University of Kentucky

  • Nathan Smith

    • Department of Physics and Astronomy, University of Kentucky

  • John Unguris

    • National Institute of Standards and Technology
    • Center for Nanoscale Science and Technology, National Institute of Standards and Technology

  • Todd Hastings

    • Department of Electrical and Computer Engineering, University of Kentucky
    • Univ of Kentucky

  • Lance De Long

    • University of Kentucky, Department of Physics and Astronomy
    • Department of Physics and Astronomy, University of Kentucky
    • Univ of Kentucky