Observation of melting instability in highly magnetized solid He-3

A melting instability has been observed during rapid melting of highly magn etized solid He-3. The instability occurred only if the solid is grown at l ow initial temperature and in high magnetic field, i.e., with high magnetiz ation, and if the solid is melted sufficiently rapidly. After the instabili ty of the interface occurred, the solid formed many cellular dendrites, dir ected parallel to the magnetic field. This is the first observation where a clear influence is seen of the magnetic field and the magnetization on a g rowth and melting process. The instability is attributed to a Mullins-Seker ka-type instability due to the magnetization gradient at the interface in t he solid.