Jackson, David P. and José A. Miranda. Controlling Fingering Instabilities in Rotating Ferrofluids. Phyiscal Review E 67, no. 1 (2003): e017301. https://journals.aps.org/pre/abstract/10.1103/PhysRevE.67.017301

We perform a detailed analytic and numerical study of the evolution of a ferrofluid drop confined to a rotating Hele-Shaw cell in the presence of an azimuthal magnetic field. Our results demonstrate that the centrifugally driven interfacial instabilities can be simply controlled with the use of a current-carrying wire. We compare an analytic linear analysis to our computational results and show that a number of observed features cannot be explained by linear theory alone, including a “diamond ring” instability that results when a droplet is nearly stabilized.

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