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2015 | 127 | 2 | 347-349
Article title

Average Magnetization and Fe Hyperfine Fields in Co₂FeSi-based Heusler Alloys

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EN
Abstracts
EN
In the present study SQUID magnetic and ^{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.
Keywords
EN
Contributors
author
  • Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.Box 49, Hungary
author
  • Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.Box 49, Hungary
author
  • Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.Box 49, Hungary
author
  • Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.Box 49, Hungary
author
  • Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.Box 49, Hungary
author
  • Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, P.O.Box 49, Hungary
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv127n2059kz
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