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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]
  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.
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. doi:10.1103/PhysRevB.98.094424.
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. doi:10.1103/PhysRevB.98.094424. https://www.osti.gov/servlets/purl/1475561.
@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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Cited by: 1 work
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