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Magnetic domain dynamics in an insulating quantum ferromagnet

Silevitch, D. M. and Xu, J. and Tang, C. and Dahmen, K. A. and Rosenbaum, T. F. (2019) Magnetic domain dynamics in an insulating quantum ferromagnet. Physical Review B, 100 (13). Art. No. 134405. ISSN 2469-9950. doi:10.1103/physrevb.100.134405. https://resolver.caltech.edu/CaltechAUTHORS:20191003-113812745

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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)F_4, 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).


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/physrevb.100.134405DOIArticle
https://arxiv.org/abs/1909.08591arXivDiscussion Paper
ORCID:
AuthorORCID
Silevitch, D. M.0000-0002-6347-3513
Xu, J.0000-0002-4743-2471
Additional Information:© 2019 American Physical Society. (Received 18 January 2019; revised manuscript received 16 June 2019; published 3 October 2019) We are grateful to P.C.E. Stamp for valuable discussions. The work at the California Institute of Technology was supported by US Department of Energy Basic Energy Sciences Award DE-SC0014866.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0014866
Issue or Number:13
DOI:10.1103/physrevb.100.134405
Record Number:CaltechAUTHORS:20191003-113812745
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20191003-113812745
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99049
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:03 Oct 2019 19:42
Last Modified:16 Nov 2021 17:43

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