Magnetic domain dynamics in an insulating quantum ferromagnet

D. M. Silevitch, J. Xu, C. Tang, K. A. Dahmen, T. F. Rosenbaum

Research output: Contribution to journalArticle

Abstract

The statistics and form of avalanches in a driven system reveal the nature of the underlying energy landscape and dynamics. In conventional metallic ferromagnets, eddy-current back action can dominate the dynamics. Here, we study Barkhausen noise in Li(Ho,Y)F4, an insulating Ising ferromagnet that cannot sustain eddy currents. For large avalanches at temperatures approaching the Curie point, we find a symmetric response free of drag effects. In the low-temperature limit, drag effects contribute to the dynamics, which we link to enhanced pinning from local random fields that are enabled by the microscopic dipole-coupled Hamiltonian (the Ising model in transverse field).

Original languageEnglish (US)
Article number134405
JournalPhysical Review B
Volume100
Issue number13
DOIs
StatePublished - Oct 3 2019

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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