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CONDENSED MATTER
Study of solid-state reactions and order-disorder transitions in Pd/á-Fe(001) thin films
S. M. Zharkovab,
E. T. Moiseenkoab,
R. R. Altuninab,
N. S. Nikolaevab,
V. S. Zhigalovac,
V. G. Myagkova a L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
b Siberian Federal University, Krasnoyarsk
c M. F. Reshetnev Siberian State Aerospace University
Abstract:
The formation of the hard-magnetic ordered
$L1_0$-FePd phase in thin bilayer Pd/
$\alpha$-Fe(001) films has been experimentally studied. Solid-state reactions initiated by thermal heating in bilayer Pd/
$\alpha$-Fe(001) films with a thickness of
$50$–
$60$ nm (the atomic ratio Pd: Fe
$\approx$ 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/
$\alpha$-Fe(001) starts at
$400\,^{\circ}$C with the formation of the disordered Fe-Pd phase. At
$400\,^{\circ}$C, the ordered
$L1_0$-FePd phase is formed. The order-disorder phase transition has been studied. It has been established that the transition of the ordered
$L1_0$-FePd phase to the disordered FePd phase starts at
$725\,^{\circ}$C. At
$740\,^{\circ}$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
$35\,^{\circ}$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.
Received: 28.02.2014
Revised: 11.03.2014
DOI:
10.7868/S0370274X14070108