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Article Dans Une Revue Physical Review E Année : 2020

Counterrotation of magnetic beads in spinning fields

Jean Farago
Thierry Charitat
Alexandre Bigot

Résumé

A magnetic stirrer, an omnipresent device in the laboratory, generates a spinning magnetic dipolelike field that drives in a contactless manner the rotation of a ferromagnetic bead on top of it. We investigate here the surprisingly complex dynamics displayed by the spinning magnetic bead emerging from its dissipatively driven, coupled translation and rotation. A particularly stunning and counterintuitive phenomenon is the sudden inversion of the bead's rotational direction, from corotation to counterrotation, acting seemingly against the driving field, when the stirrer's frequency surpasses a critical value. The bead counterrotation effect, experimentally described by Chau et al. [J. Magn. Magn. Mater. 476, 376 (2019)JMMMDC0304-885310.1016/j.jmmm.2018.12.073], is here comprehensively studied, with numerical simulations and a theoretical approach complementing experimental observations.
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Dates et versions

hal-03032594 , version 1 (30-11-2020)

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Jean Farago, Thierry Charitat, Alexandre Bigot, Romain Schotter, Igor Kulic. Counterrotation of magnetic beads in spinning fields. Physical Review E , 2020, 102 (4), pp.042201. ⟨10.1103/PhysRevE.102.042201⟩. ⟨hal-03032594⟩
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