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(Color online) Photoemission micrograph of the polished crystal surface. The field of view is 36 μm and the contrast comes from dividing two images taken at the Fe L 3-edge (707.5 eV) in positive and negative circular polarization. Variants can be assigned based on morphology.
(Color online) Manganese (left) and iron (right) L 3-edge contrast images from cooling and reheating. Mn exhibits zero magnetic contrast in this surface-sensitive technique. The boundary between Regions I and II is highly mobile and the boundary between Regions II and III is pinned by symmetry. The lower plot is the relative position of the mobile domain wall with cooling (lower arm) and then heating (upper arm).
With heating, a magnetic domain is nucleated which reduces the magnetostatic energy at the surface as it propagates. The original formalism was a martensite in contact with an epitaxial substrate but here the rigid boundary condition is a pinned twin boundary.
(Color online) After heating, Region I has transformed from band domains to maze domains in a swept first order transition. Region III has undergone line frequency doubling (branching) to minimize the magnetostatic energy.
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