Published October 1, 2019
| Accepted Version + Published
Journal Article
Open
Magnetic domain dynamics in an insulating quantum ferromagnet
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1.
California Institute of Technology
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).
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.Attached Files
Published - PhysRevB.100.134405.pdf
Accepted Version - 1909.08591.pdf
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PhysRevB.100.134405.pdf
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Additional details
- Eprint ID
- 99049
- Resolver ID
- CaltechAUTHORS:20191003-113812745
- DE-SC0014866
- Department of Energy (DOE)
- Created
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2019-10-03Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field