Chemical order and selection of the mechanism for strain relaxation in epitaxial FePd(Pt) thin layers
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- CEA Grenoble/Departement de Recherche Fondamentale sur la Matiere Condensee, Service de Physique des Materiaux et Microstructures, 17 avenue des Martyrs, 38054 Grenoble Cedex (France)
- Laboratoire de Thermodynamique et Physicochimie Metallurgiques/CNRS, BP 75, 38402 Saint Martin d'Heres (France)
We observed that the relaxation mechanism of the epitaxial strain is dramatically dependent on the chemical ordering within the L1{sub 0} structure in FePd(Pt) thin films. In disordered or weakly ordered layers, the relaxation takes place though perfect (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.
- OSTI ID:
- 20664948
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 17 Vol. 70; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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