Enhanced interaction strength in perpendicular artificial spin ice arrays

ORAL

Abstract

Perpendicular implementations of artificial spin ice are appealing as a custom designed, frustrated system due to the optical accessibility of the magnetic components. This allows for complete microstate characterization in situ with an applied field using magneto-optical Kerr effect microscopy. We have fabricated arrays of lithographically patterned, single-domain Pt/Co multilayer islands. Studies on this system thus far have been limited by the weak interactions between islands that fit the constraints necessary for optical accessibility. New samples fabricated with a permalloy underlayer show an enhancement in correlation and allow for studies beyond the weakly interacting regime. We study both the quasi-dynamic hysteresis and demagnetized states of these systems to gain an understanding of how the coupling is affected by the soft underlayer.

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Presenters

  • Susan Kempinger

    Pennsylvania State University

Authors

  • Susan Kempinger

    Pennsylvania State University

  • Yu-Sheng Huang

    Pennsylvania State University

  • Paul Edward Lammert

    Pennsylvania State University

  • MICHAEL VOGEL

    Materials Science Division, Argonne National Laboratory, Materials Science Division, ARGONNE NATIONAL LABORATORY, Argonne National Lab

  • JOHN E. PEARSON

    Argonne National Laboratory, Materials Science Division, Argonne National Laboratory, Materials Science Division, ARGONNE NATIONAL LABORATORY, Argonne National Lab

  • Axel F Hoffmann

    Materials Science Division, Argonne National Laboratory, Argonne National Laboratory, Materials Science Division, ARGONNE NATIONAL LABORATORY, Argonne National Lab

  • Vincent Henry Crespi

    Pennsylvania State University, Department of Physics, Pennsylvania State University

  • Peter E Schiffer

    Yale University

  • Nitin Samarth

    Department of Physics and Materials Research Institute, Pennsylvania State University, Physics, Penn State University, Physics, The Pennsylvania State University, Pennsylvania State University, Department of Physics, Pennsylvania State University, Materials Research Institute, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, Pennsylvania State University