Analysis of atomic ordering of the ferromagnetic Co.sub.2./sub.Fe(Ga.sub.0.5./sub.Ge.sub.0.5./sub.) Heusler compound using spectroscopic ellipsometry

0566495 - FZÚ 2023 RIV US eng J - Journal Article
Král, D. - Cejpek, P. - Kudrnovský, Josef - Drchal, Václav - Beran, L. - Vilanova, E. - Jakob, G. - Zázvorka, J. - Antoš, R. - Hamrle, J. - Veis, M.
Analysis of atomic ordering of the ferromagnetic Co₂Fe(Ga_0.5Ge_0.5) Heusler compound using spectroscopic ellipsometry.
Physical Review B. Roč. 106, č. 14 (2022), č. článku 144102. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA ČR GA19-09882S; GA ČR GA18-07172S
Institutional support: RVO:68378271
Keywords : Heusler compound Co₂Fe(Ga_0.5Ge_0.5) * spectroscopic ellipsometry * ab initio calculation * structure determination
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.7, year: 2022
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevB.106.144102

Atomic ordering of ferromagnetic alloys, such as Heusler compounds, vastly influences their magnetic properties and overall usability. However, in some cases x-ray diffraction cannot unambiguously determine the correct atomic structure, which hampers further research. In this paper, we analyze the atomic ordering using spectroscopic ellipsometry—a simple tabletop method that researchers can use in situ during sample deposition. The Co2Fe(Ga0.5Ge0.5) Heusler compound was chosen for the analysis, as the atomic ordering greatly influences its spin-polarizing capabilities. The ellispometric results are confronted with x-ray diffraction and with the help of ab initio calculations the qualitative changes in the optical response are linked to the changes in atomic ordering.
Permanent Link: https://hdl.handle.net/11104/0337812