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- Title
Study of solid-state reactions and order-disorder transitions in Pd/α-Fe(001) thin films.
- Authors
Zharkov, S.; Moiseenko, E.; Altunin, R.; Nikolaeva, N.; Zhigalov, V.; Myagkov, V.
- Abstract
The formation of the hard-magnetic ordered L1-FePd phase in thin bilayer Pd/α-Fe(001) films has been experimentally studied. Solid-state reactions initiated by thermal heating in bilayer Pd/α-Fe(001) films with a thickness of 50-60 nm (the atomic ratio Pd: Fe ≈ 50: 50) separated from the substrate have been studied using the in situ electron diffraction methods. It has been shown that the solid-state reaction between the palladium and iron layers in Pd/α-Fe(001) starts at 400°C with the formation of the disordered Fe-Pd phase. At 480°C, the ordered L1-FePd phase is formed. The order-disorder phase transition has been studied. It has been established that the transition of the ordered L1-FePd phase to the disordered FePd phase starts at 725°C. At 740°C, only the disordered FePd phase is present over the whole volume of the film. The observed temperature of the order-disorder phase transition is shifted from the equilibrium value by 35°C to higher temperatures. This effect is assumingly associated with the higher concentration of palladium atoms at the boundaries of the Fe-Pd crystal grains owing to the grain-boundary adsorption.
- Subjects
SOLID state chemistry; THIN films; PALLADIUM; IRON composites; ELECTRON diffraction; SUBSTRATES (Materials science)
- Publication
JETP Letters, 2014, Vol 99, Issue 7, p405
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364014070145