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.
*Research work is supported by ``ALS Director Fellowship'' and U.S. DoE Grant \#DE-FG02-97ER45653.
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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
