Issues $\rightarrow$ Volume 26, Issue 2 (2025)

The Role of Hydrogen Heat Treatment during Ordering Processes in FePd- and FePt-Based Nanosize Films

BARABASH M.Yu.$^{1,2}$, VERBYTSKA T.I.$^1$, and MAKOGON Yu.M.$^1$

$^1$National Technical University of Ukraine ‘Igor Sikorsky Kyiv Polytechnic Institute’, 37 Beresteiskyi Ave., UA-03056 Kyiv, Ukraine
$^2$Technical Centre of the N.A.S. of Ukraine, 13 Pokrovska Str., UA-04070 Kyiv, Ukraine

Received 12.01.2025, Final version 03.05.2025 Download PDF logo PDF

Abstract
The review presents experimental results obtained during the study of the solid-state reaction of A1→L10 ordering within the nanosize FePd and FePt films of equiatomic composition and doped with Ag, Au during annealing in both a vacuum and hydrogen. The behaviour of hydrogen within the film and its influence on the phase composition, structure, and the hydrogen-induced change in magnetic states and properties are considered. Ordering processes in films based on equiatomic FePd and FePt alloys are accelerated during annealing in a hydrogen environment compared to annealing in a vacuum. Introduction of hydrogen atoms leads to a change in electronic structure, the magnetic properties, and states of the film based on FePd. Reversible changes in the magnetic states of the FePd film are shown: ferromagnetic↔paramagnetic by changing the temperature and time of annealing the film in a hydrogen environment. The dynamics of structural changes in FePd films during the ordering processes is investigated by means of the Raman spectroscopy.

Keywords: hydrogen, annealing, ordering, L10-FePd, L10-FePt, magnetic properties, hard magnetic state, paramagnetic state, coercivity, ferromagnetic resonance, Raman spectroscopy.

DOI: https://doi.org/10.15407/ufm.26.02.***

Citation: M.Yu. Barabash, T.I. Verbytska, and Yu.M. Makogon, The Role of Hydrogen Heat Treatment during Ordering Processes in FePd- and FePt-Based Nanoscale Films, Progress in Physics of Metals, 26, No. 2: ***–*** (2025)

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