Magnetic shape memory martensite

The sample here is a Ni-24Mn-24Ga at.% alloy. This is a shape memory alloy but in addition, the martensite if ferromagnetic. This means that the martensitic transformation can be induced by an applied magnetic field; alternatively, the twins in the martensite can undergo rearrangment or detwinning under the influence of a magnetic field. This magnetically-induced changes lead to a change in shape which can be exploited in devices. The movie has been provided for teaching purposes by Professor Koichi Tsuch