Bloch-point-mediated topological transformations of magnetic domain walls in cylindrical nanowires

Abstract : Cylindrical nanowires made of soft magnetic materials, in contrast to thin strips, may host domain walls of two distinct topologies. Unexpectedly, we evidence experimentally the dynamic transformation of topology upon wall motion above a field threshold. Micromagnetic simulations highlight the underlying precessional dynamics for one way of the transformation, involving the nucleation of a Bloch-point singularity, however, fail to reproduce the reverse process. This rare discrepancy between micromagnetic simulations and experiments raises fascinating questions in material and computer science.
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Contributor : Olivier Fruchart <>
Submitted on : Wednesday, June 27, 2018 - 11:22:23 PM
Last modification on : Monday, May 20, 2019 - 9:32:55 AM
Long-term archiving on : Thursday, September 27, 2018 - 4:09:01 AM

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A Wartelle, B Trapp, M Staňo, Christophe Thirion, S Bochmann, et al.. Bloch-point-mediated topological transformations of magnetic domain walls in cylindrical nanowires. Physical Review B : Condensed matter and materials physics, American Physical Society, 2019, 99 (2), pp.024433. ⟨10.1103/PhysRevB.99.024433⟩. ⟨hal-01825020⟩

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