Abstract.
We study how a magnetic bead bounces onto a horizontal diamagnetic conducting plane. The bead, falling down by gravity from a certain height, produces an Eddy current that creates a repelling force. For low velocities the bead is trapped by the surface, for intermediate ones it escapes. In such a case the induced current changes its sign, and so does the force. The balance between diamagnetic and viscoelastic interactions determines the bouncing dynamics. We find experimentally the restitution coefficient as a function of the impact speed of the bead and develop, taking into account simple energetic considerations, a model able to reproduce our findings.
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Batista-Leyva, A.J., Ruiz-Suárez, J.C. Coefficient of restitution mediated by a diamagnetic interaction. Eur. Phys. J. E 39, 74 (2016). https://doi.org/10.1140/epje/i2016-16074-9
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DOI: https://doi.org/10.1140/epje/i2016-16074-9