title: Coefficient of restitution mediated by a diamagnetic interaction.
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.
authors.affiliation: Instituto Superior de Tecnologías y Ciencias Aplicadas (InSTEC), Salvador Allende esq. Luaces s/n, Plaza de la Revolución CP 10400, POB 6163, La Habana, Cuba.
authors.forename: A J
authors.initials: AJ
authors.lastname: Batista-Leyva
authors.affiliation: CINVESTAV-Monterrey, PIIT, Nuevo, 66600, León, Mexico. jcrs.mty@gmail.com.
authors.forename: J C
authors.initials: JC
authors.lastname: Ruiz-Suárez
mesh_terms: D004548:Elasticity; D006112:Gravitation; D008280:Magnetics; D008863:Microspheres; D014783:Viscosity
keywords: Flowing Matter: Granular Matter