Phase Composition Formation and Magnetic Properties in FePd–Au Ultrathin Films at Annealing in Vacuum and Hydrogen

M. N. Shamis$^{1}$, P. V. Makushko$^{1}$, I. D. Biesiedin$^{1}$, Ya. O. Berezniak$^{2}$, K. O. Graivoronska$^{2}$, T. I. Verbytska$^{1}$, Iu. M. Makogon$^{1}$

$^{1}$National Technical University of Ukraine ‘Igor Sikorsky Kyiv Polytechnic Institute’, 37 Peremohy Ave., UA-03056 Kyiv, Ukraine
$^{2}$I. M. Frantsevich Institute for Problems in Materials Science, NAS of Ukraine, 3 Academician Krzhyzhanovsky Str., UA-03142 Kyiv, Ukraine

Received: 26.11.2020. Download: PDF

In this work, the influence of the heat treatment ambient on the course of phase formation processes in nanosized FePd films with an additional Au layer is investigated. The FePd/Au films are obtained by magnetron deposition on a SiO$_2$/Si(001) substrate at room temperature. The total thickness of the films is 5 nm with Au sublayer thicknesses of 0.3, 0.6, and 0.9 nm. After deposition, the films are annealed in vacuum or hydrogen in the temperature range of 600–700°С with isothermal holding for 0.5–20 hours. As found, the thermal treatment in hydrogen accelerates the processes of phase formation in FePd (4.7 nm)/Au (0.3 nm) films compared to annealing in vacuum. An increase in the thickness of the additional Au layer does not contribute to the formation of the hard magnetic L1$_0$ FePd phase.

Key words: FePd thin films, annealing in vacuum and hydrogen, coercivity, ordered phase, L1$_0$ structure.



PACS: 64.60.Cn, 68.55.-a, 75.50.Ss, 75.50.Vv, 75.70.Ak, 81.30.Hd

Citation: M. N. Shamis, P. V. Makushko, I. D. Biesiedin, Ya. O. Berezniak, K. O. Graivoronska, T. I. Verbytska, and Iu. M. Makogon, Phase Composition Formation and Magnetic Properties in FePd–Au Ultrathin Films at Annealing in Vacuum and Hydrogen, Metallofiz. Noveishie Tekhnol., 43, No. 4: 505—517 (2021) (in Ukrainian)

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