title: Driven magnetic particles on a fluid surface: pattern assisted surface flows.
abstract: Magnetic microparticles suspended on the liquid-air interface and subjected to an alternating magnetic field exhibit spontaneous formation of dynamic localized snake patterns. These patterns are accompanied by four large-scale hydrodynamic vortices located at the opposite ends of the snake patterns. We report detailed studies of these large-scale vortices and their relationship to the collective response of magnetic particles in the presence of an alternating magnetic field. We present a model based on the amplitude equation for surface waves coupled to the large-scale hydrodynamic mean flow equation. The model describes both the formation of the dynamic snake patterns and the induced structure of the experimentally observed hydrodynamic flows.
authors.affiliation: Illinois Institute of Technology, 3101 South Dearborn Street, Chicago, Illinois 60616, USA.
authors.forename: M
authors.initials: M
authors.lastname: Belkin
authors.forename: A
authors.initials: A
authors.lastname: Snezhko
authors.forename: I S
authors.initials: IS
authors.lastname: Aranson
authors.forename: W-K
authors.initials: WK
authors.lastname: Kwok