Anomalous magnetization dynamics in artificial spin ice

ORAL

Abstract

Modern nanotechnology permits one to mimic bulk spin ice crystals with ordered arrays of ferromagnetic nano-islands, which constitute a method for designing fully controlled model systems for studies of frustrated magnetic interactions in two dimensions. Thermal fluctuations within a highly degenerate ground state excite topological magnetic charges, but the nature of the field-dependent equilibrium states and their magnetic dynamics has remained elusive. Here we present results of time dependent, coherent speckle intensity and X-ray correlation spectroscopy (XPCS) in a diffraction geometry, which yields information concerning the dynamics of emergent topological charge defects in a square artificial spin ice.

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Authors

  • Shrawan Mishra

    Advanced Light Source, Lawrence Berkeley National Laboratory Berkeley, CA 94720-8229, USA, Lawrence Berkeley Natl Lab

  • V.S. Bhat

    Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, KY 40506-0055, USA

  • Daniel Parks

    Advanced Light Source, Lawrence Berkeley National Laboratory Berkeley, CA 94720-8229, USA, Lawrence Berkeley Natl Lab

  • J.C.T. Lee

    Advanced Light Source, Lawrence Berkeley National Laboratory Berkeley, CA 94720-8229, USA, Lawrence Berkeley Natl Lab, Lawrence Berkely Nation Labaratory

  • Xiaowen Shi

    Advanced Light Source, Lawrence Berkeley National Laboratory Berkeley, CA 94720-8229, USA, Lawrence Berkeley Natl Lab

  • Lance DeLong

    Department of Physics and Astronomy, University of Kentucky, Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, KY 40506-0055, USA, University of Kentucky

  • Steve Kevan

    Advanced Light Source, Lawrence Berkeley National Laboratory Berkeley, CA 94720-8229, USA, Lawrence Berkeley Natl Lab

  • Sujoy Roy

    Advanced Light Source, Lawrence Berkeley National Laboratory Berkeley, CA 94720-8229, USA, Lawrence Berkeley National Laboratory, USA, Lawrence Berkeley Natl Lab