Experimental Realization of Isotropic Ising Spins in Frustrated and Unfrustrated Artificial Spin Ice with Perpendicular Anisotropy

ORAL

Abstract

We have studied lithographically defined arrays of magnetostatically interacting single domain ferromagnetic islands with moments normal to the plane, leading to fully isotropic magnetostatic interactions. Probing both frustrated kagome and unfrustrated honeycomb array geometries, we find that the spin configurations can be reproduced with models based on only nearest-neighbor correlations. While the honeycomb geometry displays ordering of moments in well-defined domains, the kagome geometry has only short range correlations that show striking similarities to those of analogous in-plane systems and are closely comparable to expectations for a simple Ising system.

*We acknowledge the financial support from DOE and Army Research Office.

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Authors

  • Sheng Zhang

    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA

  • Jie Li

    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA

  • Ian Gilbert

    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA

  • Yu Pan

    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA

  • Paul Lammert

    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA

  • Kriti Kohli

    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA

  • Rajiv Misra

    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA

  • Vincent Crespi

    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA

  • Nitin Samarth

    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA

  • Peter Schiffer

    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA

  • Cristiano Nisoli

    • Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA

  • Mike Erickson

    • Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA

  • Chris Leighton

    • Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA