A magnetic fluid drop lying on a horizontal solid surface subjected to a vertical magnetic field H₀ peaks with a cone shape above a threshold value Hc. If H₀ is tilted, i.e., not parallel to the gravitational field, the shape becomes asymmetric. Using a tilted alternating magnetic field we observed the motion of the drop. We have measured this drift velocity, and we propose a simple two-level model to explain this new motion. Finally, we present another experiment with the same device concerning the free surface of a magnetic fluid: the so-called drifting instability.
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Elias et al. (1996) studied this question.