Magnetic Properties of Fe$_2$CrGa Heusler Alloy Films

Magnetic Properties of Fe $_2$ CrGa Heusler Alloy Films

Yu. V. Kudryavtsev $^{1}$ , V. O. Golub $^{2}$ , A. O. Perekos $^{1}$ , T. G. Kabantsev $^{2}$ , M. P. Melnyk $^{1}$ , V. Yu. Tarenkov $^{3}$

$^{1}$ Институт металлофизики им. Г. В. Курдюмова НАН Украины, бульв. Академика Вернадского, 36, 03142 Киев, Украина
$^{2}$ Институт магнетизма НАН и МОН Украины, бульв. Академика Вернадского, 36б, 03142 Киев, Украина
$^{3}$ Донецкий физико-технический институт им. А. А. Галкина НАН Украины, ул. Р. Люксембург, 72, 83114 Донецк, Украина

Получена: 11.04.2023; окончательный вариант - 13.04.2023. Скачать: PDF

Static and dynamical magnetic properties of the amorphous and crystalline $A$ 2-type ordered Heusler Fe $_2$ CrGa-alloy films are investigated and compared with the properties of the bulk $A$ 2-type ordered Fe $_2$ CrGa alloy. Unlike literature results for bulk Fe $_2$ CrGa alloy, a complete structural disorder in amorphous state gives rise to a drastic decrease of alloy saturation magnetization. Annealing of amorphous films at $T_{\textrm{ann}}$ = 740 K leads to their crystallization with the formation of the disordered $A$ 2-type structure and the magnetic properties of such crystalline films close to those of bulk alloy. Ferromagnetic resonance (FMR) investigations show that both amorphous and crystalline Fe $_2$ CrGa-alloy films are microscopically inhomogeneous in both magnetic and structural aspects. Based on the FMR spectra analysis, it can be concluded that, in crystalline Fe $_2$ CrGa-alloy films, there are regions with order close to the crystallographic $L$ 2 $_1$ and Hg $_2$ CuTi types. These results perfectly correlate with first-principal calculations of the magnetic properties of Fe $_2$ CrGa alloy. As shown, the Slater–Pauling rule is not applicable for full Heusler alloys with inverse crystalline Hg $_2$ CuTi-type structure.

Ключевые слова: thin magnetic films, amorphous state, atomic ordering, ferromagnetic resonance, Heusler alloys.

URL: https://mfint.imp.kiev.ua/ru/abstract/v45/i04/0431.html

PACS: 61.43.Dq, 68.55.-a, 75.70.Ak, 76.50.+g, 81.15.Ef

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