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Title: Observation of transient states during magnetization reversal in a quasicrystal artificial spin ice

Abstract

Artificial spin ices (ASIs) consisting of arrays of magnetic bars are key systems in the study of geometric frustration in magnetic systems. Of particular interest are quasicrystal (QC) ASIs, in which the lack of translational symmetry and the varying coordination number of interacting bars allow for topologically enhanced frustrated magnetization to occur. We have directly observed the formation of magnetic vortexes within the vertices of a QC-ASI as a metastable transient state, during the magnetization reversal process. We observed that the vortexes primarily form in a specific subset of the vertex motif types. Furthermore, micromagnetic simulations show that although these magnetic vortexes result in an increase in the local energy of the vertex before the magnetization of the bars reverses to align with the applied magnetic field, the overall energy increase is lower than the higher energy motif configurations that would result from reversal of the magnetization in the connecting bar.

Authors:
 [1];  [2];  [3];  [1]
+ Show Author Affiliations
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
  2. College of DuPage, Glen Ellyn, IL (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE
OSTI Identifier:
1475561
Alternate Identifier(s):
OSTI ID: 1473747
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Brajuskovic, V., Addi, A., Phatak, C., and Petford-Long, A. K. Observation of transient states during magnetization reversal in a quasicrystal artificial spin ice. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.094424.
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Brajuskovic, V., Addi, A., Phatak, C., & Petford-Long, A. K. Observation of transient states during magnetization reversal in a quasicrystal artificial spin ice. United States. https://doi.org/10.1103/PhysRevB.98.094424
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Brajuskovic, V., Addi, A., Phatak, C., and Petford-Long, A. K. Tue . "Observation of transient states during magnetization reversal in a quasicrystal artificial spin ice". United States. https://doi.org/10.1103/PhysRevB.98.094424. https://www.osti.gov/servlets/purl/1475561.
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@article{osti_1475561,
title = {Observation of transient states during magnetization reversal in a quasicrystal artificial spin ice},
author = {Brajuskovic, V. and Addi, A. and Phatak, C. and Petford-Long, A. K.},
abstractNote = {Artificial spin ices (ASIs) consisting of arrays of magnetic bars are key systems in the study of geometric frustration in magnetic systems. Of particular interest are quasicrystal (QC) ASIs, in which the lack of translational symmetry and the varying coordination number of interacting bars allow for topologically enhanced frustrated magnetization to occur. We have directly observed the formation of magnetic vortexes within the vertices of a QC-ASI as a metastable transient state, during the magnetization reversal process. We observed that the vortexes primarily form in a specific subset of the vertex motif types. Furthermore, micromagnetic simulations show that although these magnetic vortexes result in an increase in the local energy of the vertex before the magnetization of the bars reverses to align with the applied magnetic field, the overall energy increase is lower than the higher energy motif configurations that would result from reversal of the magnetization in the connecting bar.},
doi = {10.1103/PhysRevB.98.094424},
journal = {Physical Review B},
number = 9,
volume = 98,
place = {United States},
year = {2018},
month = {9}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevB.98.094424
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Cited by: 2 works
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Figures / Tables:

Figure 1 Figure 1: a) A bright field TEM image of a QC ASI. The orange dashed line indicates a direction of high symmetry along the QC ASI and the white dashed line indicates a direction of low symmetry along the QC ASI. b) A closeup view of one of the barsmore » in the QC ASI. The green arrow indicates the direction of magnetization as determined by the direction of the intensity gradient represented by the red arrow. c) A graph showing the intensity as a function of distance along the blue line in b). d) Hysteresis loops for magnetization reversal with the applied field along the high symmetry direction shown with blue triangles and along the low symmetry direction shown with green circles. The black arrows next to each branch of the hysteresis loops indicate the direction of the field sweep.« less
All figures and tables (6 total)
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Works referenced in this record:

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Realization of ground state in artificial kagome spin ice via topological defect-driven magnetic writing
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journal, October 2011

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journal, November 2010

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journal, August 2013

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journal, October 2015

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journal, May 2014

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journal, April 2016

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journal, January 2013

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journal, April 2013

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journal, January 2008

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journal, December 2017

Magnetic charge and moment dynamics in artificial kagome spin ice
journal, August 2017

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    Works referencing / citing this record:

    Advances in artificial spin ice
    journal, November 2019

    • Skjærvø, Sandra H.; Marrows, Christopher H.; Stamps, Robert L.
    • Nature Reviews Physics, Vol. 2, Issue 1
    • DOI: 10.1038/s42254-019-0118-3

    Elevated effective dimension in tree-like nanomagnetic Cayley structures
    journal, January 2020

    • Saccone, Michael; Hofhuis, Kevin; Bracher, David
    • Nanoscale, Vol. 12, Issue 1
    • DOI: 10.1039/c9nr07510k

    Dipolar Cairo lattice: Geometrical frustration and short-range correlations
    journal, October 2019

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      Figures / Tables found in this record:

      Figure 1 (p. 12)figure
      Figure 2 (p. 13)figure
      Figure 3 (p. 14)figure
      Figure 4 (p. 15)figure
      Figure 5 (p. 16)figure
      Figure 6 (p. 16)figure
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