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Ion beam analysis of quaternary Heusler alloy Co$$_{2}$$(Mn$$_{1-x}$$Fe$$_{x}$$)Si(111) epitaxially grown on Ge(111)

Kawakubo, Yuki*; Noguchi, Masaya*; Hirata, Tomoaki*; Narumi, Kazumasa; Sakai, Seiji; Yamada, Shinya*; Hamaya, Kohei*; Miyao, Masanobu*; Maeda, Yoshihito

We have investigated crystal quality of Co$$_{2}$$(Mn$$_{1-x}$$Fe$$_{x}$$)Si (CMFS) epitaxially grown on Ge(111) by using Rutherford-backscattering spectrometry and an axial-ion-channeling technique. It was found that the CMFS/Ge and Co$$_{2}$$FeSi (CMFS with x = 1)/Ge have larger static atomic displacement than Fe-based ternary Heusler alloy Fe$$_{2}$$MnSi and Fe$$_{2}$$CoSi/Ge(111). Quaternary alloys may be affected by increase of mixing entropy. Significant disordering at the interface of CMFS with x = 0.75 was found, and discussed on the basis of thermodynamics.

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