Non-stochastic switching and emergence of magnetic vortices in artificial quasicrystal spin ice

V. S. Bhat; B. Farmer; N. Smith; E. Teipel; J. Woods; J. Sklenar; J. B. Ketterson; J. T. Hastings; L. E. De Long

doi:10.1016/j.physc.2014.04.043

Non-stochastic switching and emergence of magnetic vortices in artificial quasicrystal spin ice

V. S. Bhat, B. Farmer, N. Smith, E. Teipel, J. Woods, J. Sklenar, J. B. Ketterson, J. T. Hastings, L. E. De Long

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Previous studies of artificial spin ice have been largely restricted to periodic dot lattices. Ferromagnetic switching of segments in an applied magnetic field is stochastic in periodic spin ice systems, which makes emergent phenomena, such as the formation of vortex loops, hard to control or predict. We fabricated finite, aperiodic Penrose P2 tilings as antidot lattices with fivefold rotational symmetry in permalloy thin films. Measurements of the field dependence of the static magnetization reveal reproducible knee anomalies whose number and form are temperature dependent, which suggests they mark cooperative rearrangements of the tiling magnetic texture. Our micromagnetic simulations of the P2 tiling are in good agreement with experimental magnetization data and exhibit non-stochastic magnetic switching of segments in applied field, and vortex loops that are stable over an extended field interval during magnetic reversal.

Original language	English
Pages (from-to)	170-174
Number of pages	5
Journal	Physica C: Superconductivity and its Applications
Volume	503
DOIs	https://doi.org/10.1016/j.physc.2014.04.043
State	Published - Aug 15 2014

Bibliographical note

Funding Information:
Research at the University of Kentucky was supported by U.S. DoE Grant #DE-FG02-97ER45653 and U.S. NSF Grant #EPS-0814194, and the University of Kentucky Center for Computational Sciences.

Keywords

Artificial spin ice
Ferromagnetic switching
Geometrical frustration
Magnetic vortices
Micromagnetic simulations
Quasicrystal

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/j.physc.2014.04.043

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title = "Non-stochastic switching and emergence of magnetic vortices in artificial quasicrystal spin ice",

abstract = "Previous studies of artificial spin ice have been largely restricted to periodic dot lattices. Ferromagnetic switching of segments in an applied magnetic field is stochastic in periodic spin ice systems, which makes emergent phenomena, such as the formation of vortex loops, hard to control or predict. We fabricated finite, aperiodic Penrose P2 tilings as antidot lattices with fivefold rotational symmetry in permalloy thin films. Measurements of the field dependence of the static magnetization reveal reproducible knee anomalies whose number and form are temperature dependent, which suggests they mark cooperative rearrangements of the tiling magnetic texture. Our micromagnetic simulations of the P2 tiling are in good agreement with experimental magnetization data and exhibit non-stochastic magnetic switching of segments in applied field, and vortex loops that are stable over an extended field interval during magnetic reversal.",

keywords = "Artificial spin ice, Ferromagnetic switching, Geometrical frustration, Magnetic vortices, Micromagnetic simulations, Quasicrystal",

author = "Bhat, {V. S.} and B. Farmer and N. Smith and E. Teipel and J. Woods and J. Sklenar and Ketterson, {J. B.} and Hastings, {J. T.} and {De Long}, {L. E.}",

note = "Funding Information: Research at the University of Kentucky was supported by U.S. DoE Grant #DE-FG02-97ER45653 and U.S. NSF Grant #EPS-0814194, and the University of Kentucky Center for Computational Sciences. ",

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doi = "10.1016/j.physc.2014.04.043",

language = "English",

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AU - Bhat, V. S.

AU - Farmer, B.

AU - Smith, N.

AU - Teipel, E.

AU - Woods, J.

AU - Sklenar, J.

AU - Ketterson, J. B.

AU - Hastings, J. T.

AU - De Long, L. E.

N1 - Funding Information: Research at the University of Kentucky was supported by U.S. DoE Grant #DE-FG02-97ER45653 and U.S. NSF Grant #EPS-0814194, and the University of Kentucky Center for Computational Sciences.

PY - 2014/8/15

Y1 - 2014/8/15

N2 - Previous studies of artificial spin ice have been largely restricted to periodic dot lattices. Ferromagnetic switching of segments in an applied magnetic field is stochastic in periodic spin ice systems, which makes emergent phenomena, such as the formation of vortex loops, hard to control or predict. We fabricated finite, aperiodic Penrose P2 tilings as antidot lattices with fivefold rotational symmetry in permalloy thin films. Measurements of the field dependence of the static magnetization reveal reproducible knee anomalies whose number and form are temperature dependent, which suggests they mark cooperative rearrangements of the tiling magnetic texture. Our micromagnetic simulations of the P2 tiling are in good agreement with experimental magnetization data and exhibit non-stochastic magnetic switching of segments in applied field, and vortex loops that are stable over an extended field interval during magnetic reversal.

AB - Previous studies of artificial spin ice have been largely restricted to periodic dot lattices. Ferromagnetic switching of segments in an applied magnetic field is stochastic in periodic spin ice systems, which makes emergent phenomena, such as the formation of vortex loops, hard to control or predict. We fabricated finite, aperiodic Penrose P2 tilings as antidot lattices with fivefold rotational symmetry in permalloy thin films. Measurements of the field dependence of the static magnetization reveal reproducible knee anomalies whose number and form are temperature dependent, which suggests they mark cooperative rearrangements of the tiling magnetic texture. Our micromagnetic simulations of the P2 tiling are in good agreement with experimental magnetization data and exhibit non-stochastic magnetic switching of segments in applied field, and vortex loops that are stable over an extended field interval during magnetic reversal.

KW - Artificial spin ice

KW - Ferromagnetic switching

KW - Geometrical frustration

KW - Magnetic vortices

KW - Micromagnetic simulations

KW - Quasicrystal

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JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

ER -

Non-stochastic switching and emergence of magnetic vortices in artificial quasicrystal spin ice

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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