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.

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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