Abstract
We observed that the relaxation mechanism of the epitaxial strain is dramatically dependent on the chemical ordering within the $L{1}_{0}$ structure in FePd(Pt) thin films. In disordered or weakly ordered layers, the relaxation takes place though perfect $\frac{1}{2}[101]$ dislocations, whereas well-ordered films relax through the partial $1∕6[112]$ Shockley dislocations, piled-up within microtwins, with a huge impact on both the morphology and the magnetic properties of the film. We show that the antiphase boundary energy is the key factor preventing the propagation of perfect dislocations in ordered alloys.
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