Motion of a deformable drop of magnetic fluid on a solid surface in a   rotating magnetic field
  The behavior of a magnetic fluid drop lying on a solid horizontal surface and surrounded by a nonmagnetic liquid under the action of a uniform magnetic field which is rotating in a vertical plane with low frequency (of the order of 1 Hz) has been investigated experimentally. Shape deformation and translatory motion of the drop were observed and studied. The drop translation velocity for different field amplitudes and field frequencies has been measured. 
Arthur Zakinyan, Oksana Nechaeva, Yury Dikansky
cond-mat.soft physics.flu-dyn