Nonstochastic magnetic reversal in artificial quasicrystalline spin ice

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

doi:10.1063/1.4869288

Nonstochastic magnetic reversal in artificial quasicrystalline spin ice

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

^*Corresponding author for this work

Physics and Astronomy

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

6 Scopus citations

Abstract

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.

Original language	English (US)
Article number	17E133
Journal	Journal of Applied Physics
Volume	115
Issue number	17
DOIs	https://doi.org/10.1063/1.4869288
State	Published - May 7 2014

ASJC Scopus subject areas

General Physics and Astronomy

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10.1063/1.4869288

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title = "Nonstochastic magnetic reversal in artificial quasicrystalline spin ice",

abstract = "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.",

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AU - Farmer, B.

AU - Bhat, V. S.

AU - Sklenar, J.

AU - Woods, J.

AU - Teipel, E.

AU - Smith, N.

AU - Ketterson, J. B.

AU - Hastings, J. T.

AU - De Long, L. E.

PY - 2014/5/7

Y1 - 2014/5/7

N2 - 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.

AB - 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.

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Nonstochastic magnetic reversal in artificial quasicrystalline spin ice

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