Visualization of Spontaneous Domain Wall Fluctuation in Artificial Spin Ice using Bragg Coherent Diffraction Imaging (BCDI)

ORAL

Abstract

Inhomogeneity caused by a defect is known to play an important role in the emergence of long-range order and phase stability in strongly correlated systems. But their role in an artificial mesoscopic system is not very well understood. We studied spontaneous domain wall fluctuations in a dipolar-coupled antiferromagnetic (AF) artificial lattice for a wide temperature range by introducing defects to the magnetic lattice. BCDI reconstruction was performed using speckles under the half-integer AF peaks, revealing seconds-to-milliseconds timescale nucleation and annihilation of single domain wall. Our result shows that BCDI is an effective method of measuring fast fluctuation in the vicinity of a phase transition.

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Presenters

  • Xiaoqian Chen

    University of Kentucky and Lawrence Berkeley National Laboratory

Authors

  • Xiaoqian Chen

    University of Kentucky and Lawrence Berkeley National Laboratory

  • Wen Hu

    Brookhaven National Laboratory, National Synchrotron Light Source II, Brookhaven National Laboratory

  • Xiaojing Huang

    Brookhaven National Laboratory

  • Justin Woods

    University of Kentucky, Physics, University of Kentucky

  • Sujoy Roy

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

  • Jeffrey Hastings

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

  • Ian Robinson

    Brookhaven National Laboratory, CMPMSD, Brookhaven National lab, Condensed Matter Physics and Material Science Department, Brookhaven National Laboratory