6533b82bfe1ef96bd128e349

RESEARCH PRODUCT

Spontaneous order in ensembles of rotating magnetic droplets

Andrejs CēbersRégine PerzynskiA.p. StikutsA.p. Stikuts

subject

010302 applied physicsRange (particle radiation)Materials scienceField (physics)Dynamics (mechanics)Fluid Dynamics (physics.flu-dyn)FOS: Physical sciencesField strengthPhysics - Fluid Dynamics02 engineering and technologyCondensed Matter - Soft Condensed MatterSolid wall021001 nanoscience & nanotechnologyCondensed Matter PhysicsRotation01 natural sciencesMolecular physicsElectronic Optical and Magnetic MaterialsPhysics::Fluid DynamicsColloid0103 physical sciencesPhysics::Atomic and Molecular ClustersSoft Condensed Matter (cond-mat.soft)Self-assembly0210 nano-technology

description

Ensembles of elongated magnetic droplets in a rotating field are studied experimentally. In a given range of field strength and frequency the droplets form rotating structures with a triangular order - rotating crystals. A model is developed to describe ensembles of several droplets, taking into account the hydrodynamic interactions between the rotating droplets in the presence of a solid wall below the rotating ensemble. A good agreement with the experimentally observed periodic dynamics for an ensemble of four droplets is obtained. During the rotation, the tips of the elongated magnetic droplets approach close to one another. An expression is derived that gives the magnetic interaction between such droplets by taking into account the coulombian forces between magnetic charges on the droplet tips.

yearjournalcountryeditionlanguage
2019-09-02
https://dx.doi.org/10.48550/arxiv.1909.00661