fig8

Figure 8. (A) Free energy and domain evolution path around the MPB: (a) rhombohedral side and (b) tetragonal side. (B) Dislocation structures in pre-transitional materials prior to the formation of embryos. The estimated dislocation densities are generated from randomly placed Frank-Read sources under uniaxial stress. (C) The sequence of embryonic microstructures under a quasi-static cycling magnetic field. The different orientations of embryo variants are colored red, green, and blue, respectively. (D) Longitudinal strain responses to a quasi-static cycling magnetic field^[115].