Issues »  Volume 45, Issue 4

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$^{3}$

$^{1}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$Institute of Magnetism under NAS and MES of Ukraine, 36b Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{3}$Donetsk Institute for Physics and Engineering Named after O. O. Galkin, NAS of Ukraine, 72 R. Luxembourg Str., 83114 Donetsk, Ukraine

Received: 11.04.2023; final version - 13.04.2023. Download: 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.

Key words: thin magnetic films, amorphous state, atomic ordering, ferromagnetic resonance, Heusler alloys.

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

DOI: https://doi.org/10.15407/mfint.45.04.0431

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

Citation: Yu. V. Kudryavtsev, V. O. Golub, A. O. Perekos, T. G. Kabantsev, M. P. Melnyk, and V. Yu. Tarenkov, Magnetic Properties of Fe$_2$CrGa Heusler Alloy Films, Metallofiz. Noveishie Tekhnol., 45, No. 4: 431—441 (2023)

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