Collection of scientific works Nanosystems, nanomaterials, nanotechnologies Year 2023 Volume 21, Issue 4
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L. S. LEVCHUK, R. A. SHKARBAN, D. S. LEONOV, T. I. VERBYTSKA, M. Yu. BARABASH, and Iu. M. MAKOGON
A1-to-L10 phase Transformation in Nanoscale FePd–Ag Films During Annealing in Vacuum and H2
687–699 (2023)

PACS numbers: 64.60.Cn, 68.35.Ct, 68.37.Ps, 68.55.J-, 75.50.Vv, 75.70.Ak, 81.30.Hd

In this work, the influence of the heat-treatment environment (vacuum, hydrogen) on the processes of ordering in the nanoscale FePd films with an additional layer of Ag is investigated. FePd/Ag films are obtained by combined magnetron deposition of FePd-alloy layers of equiatomic composition and Ag on the SiO2/Si(001) substrate at room temperature. The total thickness of the films is of 5 nm, and the thickness of the Ag layer varies from 0.3 nm to 0.9 nm. After deposition, the film is annealed in a vacuum or in a hydrogen atmosphere at a temperature of 600–700?C. The duration of annealing in a vacuum is of 0.5–20 hours, and in H2, it is of 0.5–1 hours. As established, heat treatment in a hydrogen, compared to annealing in a vacuum, accelerates the ordering process and L10-phase formation that changes magnetic states in the FePd(4.7 nm)/Ag(0.3 nm) films and promotes the formation of films with both anisotropic magnetic properties and a smooth surface. An increase in the thickness of the additional Ag layer in the films is accompanied by a decrease in the coercivity.

Key words: thin films, FePd/Ag, hydrogen, annealing, L10-ordered phase, coercive force.

Issue DOI:  https://doi.org/10.15407/nnn.21.04.687

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