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Title: Nonstochastic magnetic reversal in artificial quasicrystalline spin ice

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.
Authors:
; ; ; ; ;  [1] ; ;  [2] ;  [3]
  1. Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 (United States)
  2. Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208 (United States)
  3. Department of Electrical and Computer Engineering, University of Kentucky, Lexington, Kentucky 40506 (United States)
Publication Date:
OSTI Identifier:
22273712
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; CRYSTALS; FERROMAGNETIC MATERIALS; FERROMAGNETISM; ICE; MAGNETIC FIELD REVERSAL; MAGNETIZATION; ORIENTATION; PERMALLOY; POLARIZATION; SPIN; SYMMETRY; THIN FILMS