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.

*This project was funded by the US Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Grant No. DE- SC0010778

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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