Influence of an Atmosphere of Annealing on Magnetic Properties of Nanosize Films of FePt Alloy

I. O. Kruhlov$^{1}$, V. V. Mohylko$^{1}$, I. A. Vladymyrskyi$^{1}$, Iu. M. Makogon$^{1}$, M. O. Vasylyev$^{2}$, S. I. Sidorenko$^{1}$, S. M. Voloshko$^{1}$

$^{1}$National Technical University of Ukraine ‘Igor Sikorsky Kyiv Polytechnic Institute’, 37 Peremohy Ave., UA-03056 Kyiv, Ukraine
$^{2}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received: 29.10.2018. Download: PDF

The features of the structure and phase-composition formations as well as magnetic properties of the 30 nm thick FePt-alloy films after heat treatment in the inert (Ar) and combined (Ar + 3% H$_2$) atmospheres in the temperature range 500–900°C are investigated. The effect of thermal stabilization of both the size of the coherent-scattering areas of the ordered $L1_0$-FePt phase and values of the films’ surface roughness with addition of hydrogen to the annealing atmosphere is revealed. Hydrogen influence also appears in acceleration of the ordering processes and increasing of film-material coercivity at low temperatures in comparison with the neutral annealing atmosphere.

Key words: nanosize film, ordering, annealing atmosphere, coercivity.



PACS: 66.30.Pa, 68.55.-a, 75.50.Ss, 75.50.Vv, 75.70.Ak, 75.70.Kw, 81.40.Ef

Citation: I. O. Kruhlov, V. V. Mohylko, I. A. Vladymyrskyi, Iu. M. Makogon, M. O. Vasylyev, S. I. Sidorenko, and S. M. Voloshko, Influence of an Atmosphere of Annealing on Magnetic Properties of Nanosize Films of FePt Alloy, Metallofiz. Noveishie Tekhnol., 41, No. 2: 157—171 (2019) (in Ukrainian)

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