The force which was exerted on a twinning dislocation in a ferromagnetic or ferroelectric material, by a magnetic or electric field, was deduced. This appeared to be the first attempt to link such an external field to shear stresses in the twinning plane and to the motion of twinning dislocations.

The Force of a Magnetic/Electric Field on a Twinning Dislocation. P.Müllner, K.Ullakko: Physica Status Solidi B, 1998, 208[1], R1-2