- Tytuł:
- Average Magnetization and Fe Hyperfine Fields in Co₂FeSi-based Heusler Alloys
- Autorzy:
-
Kiss, L.
Bortel, G.
Bujdosó, L.
Kaptás, D.
Kemény, T.
Vincze, I. - Tematy:
-
75.50.Cc
76.80.+y - Pokaż więcej
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Powiązania:
- https://bibliotekanauki.pl/articles/1385600.pdf Link otwiera się w nowym oknie
- Opis:
- In the present study SQUID magnetic and $\text{}^{57}Fe$ Mössbauer measurements were performed on bulk $Co₂FeAl_{1-x}Siₓ$, $Co₂Fe_{0.9}TM_{0.1}Si$ (TM = Ti, V, Cr, Mn, Co, Ni, Cu), $Co_{2-y}Fe_{1+y}Si$ and $Co₂Fe_{1+z}Si_{1-z}$ samples prepared by induction melting. The $Co₂FeAl_{1-x}Siₓ$ shows the L2₁ crystal structure only for x ≥ 0.5, between x = 0 and 0.3 it has the B2 structure (Fe-Al, Si disorder). The average magnetization of these alloys does not follow the expected Slater-Pauling trend (on the Si side saturation is observed around 5.75 $μ_{B}$/f.u.) and similar deviation is observed for the replacement of Fe by transition metal (TM) atom. The effect of the antisite disorder (Fe-Si) on the magnetization and Fe hyperfine parameters was determined and significant decrease in the Co magnetic moment for excess Si neighbourhood is extrapolated. The formerly reported large ≈ 6 $μ_{B}$/f.u. magnetization for Co₂FeSi was observed only in samples having Fe excess and Si deficiency.
- Dostawca treści:
- Biblioteka Nauki
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