Role of Lattice Defects in Artificial Spin Ice Studied with Coherent X-ray Scattering and XMCD-PEEM

ORAL

Abstract

Magnetically frustrated materials are unable to satisfy all competing interactions simultaneously. The introduction of a small defect in such a system can completely alter the ground state. We used coherent x-ray scattering and XMCD-PEEM to investigate the role of lattice defects in artificial spin ice. We observed reduced blocking temperature and the broadening of the phase coexistence region with increased doping. In addition, we observed defect pinnings of superdomain walls in a nontrivial manner as the temperature is varied through the transition.

*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.

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Presenters

  • Xiaoqian M Chen

    • Materials Sciences Division, Lawrence Berkeley National Laboratory, and University of Kentucky
    • Lawrence Berkeley National Laboratory and University of Kentucky

Authors

  • Xiaoqian M Chen

    • Materials Sciences Division, Lawrence Berkeley National Laboratory, and University of Kentucky
    • Lawrence Berkeley National Laboratory and University of Kentucky

  • Barry W Farmer

    • University of Kentucky
    • Physics, University of Kentucky

  • Justin Woods

    • University of Kentucky
    • Physics, University of Kentucky

  • Lance De Long

    • University of Kentucky
    • Physics, University of Kentucky

  • Sujoy Roy

    • Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA
    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • ALS, Lawrence Berkeley National Laboratory

  • Jeffrey T Hastings

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