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This content will become publicly available on December 11, 2018

Title: Frustration and thermalization in an artificial magnetic quasicrystal

Here, artificial frustrated systems offer a playground to study the emergent properties of interacting systems. Most work to date has been on spatially periodic systems, known as artificial spin ices when the interacting elements are magnetic. Here we have studied artificial magnetic quasicrystals based on quasiperiodic Penrose tiling patterns of interacting nanomagnets. We construct a low-energy configuration from a step-by-step approach that we propose as a ground state. Topologically induced emergent frustration means that this configuration cannot be constructed from vertices in their ground states. It has two parts, a quasi-one-dimensional ‘skeleton’ that spans the entire pattern and is capable of long-range order, surrounding ‘flippable’ clusters of macrospins that lead to macroscopic degeneracy. Magnetic force microscopy imaging of Penrose tiling arrays revealed superdomains that are larger for more strongly coupled arrays, especially after annealing the array above its blocking temperature.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3] ;  [1] ; ORCiD logo [4] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Univ. of Leeds, Leeds (United Kingdom)
  2. Institute for Scientific Interchange Foundation, Torino (Italy)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Univ. of Leeds, Leeds (United Kingdom); Georgetown Univ., Washington, D.C. (United States)
Publication Date:
Report Number(s):
BNL-205652-2018-JAAM
Journal ID: ISSN 1745-2473
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 14; Journal Issue: 3; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; artificial spin ice; Magnetic properties and materials; Nanoscale materials; Statistical physics
OSTI Identifier:
1437947