Study of Solid-State Reactions and Order-Disorder Transitions in Pd/alpha-Fe(001) Thin Films | Научно-инновационный портал СФУ

Study of Solid-State Reactions and Order-Disorder Transitions in Pd/alpha-Fe(001) Thin Films

Тип публикации: статья из журнала

Год издания: 2014

Идентификатор DOI: 10.1134/S0021364014070145

Аннотация: 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 approximate to 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 degrees C with the formation of the disordered Fe-Pd phase. At 480 degrees 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 degrees C. At 740 degrees 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 degrees 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.

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Выпуск журнала: Vol. 99, Is. 7

Номера страниц: 405-409

ISSN журнала: 00213640

Место издания: NEW YORK



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