Heusler compounds are magnetic intermetallics with face-centered cubic or body-centered tetragonal crystal structure and a composition of XYZ or X2YZ, where X and Y are transition metals and Z is in t
A schematic of a HH thermoelectric. X and Z have a larger electronegativity difference between them and form an NaCl-type ionic sublattice while Y and Z form a ZnS-type covalent sublattice
Electron microscope images of Cu-Mn-Al Heusler compound showing magnetic domain walls tied to APB's (a) L21 antiphase boundaries by <111> dark-field imaging - the remaining micrographs are in bright-field so that the APB's are not in contrast (b) magnetic domains by Foucault (displaced aperture) imaging, and (c) magnetic domain walls by Fresnel (defocus) imaging.