Spontaneous Domain Wall Fluctuation in Artificial Square Spin Ice Studied with Soft X-Ray Photon Correlation Spectroscopy

ORAL

Abstract

Artificial spin ice (ASI) systems, initially introduced to model spin ice systems in nature, are 2D array of frustrated dipolar-coupled nanomagnets. We performed soft x-ray photon correlation spectroscopy (XPCS) on the antiferromagnetic Bragg peak of thermally active square ASI and studied its domain wall dynamics as functions of temperature. Our result shows seconds-to-milliseconds timescale nucleation and annihilation of a single domain wall in the region under-study. We calculated the respective autocorrelation functions of domain fluctuation, whose characteristic curvatures indicates the distinct fluctuation time scale of the ASI systems that are coupled through dipole interaction.

*This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0016519.

–

Presenters

  • Jeffrey Hastings

    • University of Kentucky
    • Electrical and Computer Engineering, University of Kentucky

Authors

  • Xiaoqian Chen

    • University of Kentucky and Lawrence Berkeley National Laboratory

  • James Lee

    • ALS, Lawrence Berkeley National Laboratory

  • Sujoy Roy

    • Lawrence Berkeley National Laboratory
    • ALS, Lawrence Berkeley National Laboratory
    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Barry Farmer

    • Physics, University of Kentucky

  • Justin Woods

    • University of Kentucky
    • Physics, University of Kentucky

  • Lance De Long

    • Physics, University of Kentucky

  • Jeffrey Hastings

    • University of Kentucky
    • Electrical and Computer Engineering, University of Kentucky