Topological magnetic hysteresis in single crystals of CeAgSb2 ferromagnet

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2022-02-02
Authors
Prozorov, Ruslan
Bud'ko, Sergey L.
Canfield, Paul
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IOP Publishing Ltd.
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Physics and Astronomy
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Ames Laboratory
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Physics and AstronomyAmes Laboratory
Abstract
Closed-topology magnetic domains are usually observed in thin films and in an applied magnetic field. Here we report the observation of rectangular cross-section tubular ferromagnetic domains in thick single crystals of CeAgSb2 in zero applied field. Relatively low exchange energy, small net magnetic moment, and anisotropic in-plane crystal electric fields lower the domain wall energy and allow for the formation of the closed-topology patterns. The tubular domain structure irreversibly transforms into a dendritic pattern upon cycling the magnetic field. This transition between closed and open topologies results in a 'topological magnetic hysteresis'— the actual hysteresis in magnetization, not due to the imperfections and pinning, but due to the difference in the pattern morphology. Similar physics was suggested before in pure type-I superconductors and is believed to be a generic feature of other nonlinear single (present case), or two-phase (type-I superconductor) systems where the effects similar to demagnetization (shape-dependent macroscopic variation of properties) lead to pattern formation.
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This is the Accepted Manuscript version of an article accepted for publication in Journal of Physics: Condensed Matter. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it.  The Version of Record is available online at DOI: 10.1088/1361-648X/ac4c13. Copyright 2022 IOP Publishing Ltd. CC BY-NC-ND 4.0. Posted with permission.
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