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

100%

Kiss L., Bortel G., Bujdosó L., Kaptás D., Kemény T., Vincze I.

Acta Physica Polonica A

2015

vol. 127

issue 2

347-349

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.

^1H NMR on (Ni_xMn_{1-x})_3[Cr(CN)_6]_2 · nH_2O

84%

Bokor M., Tompa K., Kiss L., Zentková M., Zentko A., Mihalik M., Maťaš S., Mitróová Z.

Acta Physica Polonica A

2008

vol. 113

issue 1

485-488

We report on ^1H NMR of (Ni_xMn_{1-x})3[Cr(CN)_6]_2·15H_2O hexacyanochromates, where x changes from 0 to 1. The decay time constants of the free induction decay signals described by an effective spin-spin relaxation time T_{2eff} obtained from M(t) = M_0 exp(t/T_{2eff}) decrease as the local magnetic moments increase produced by the magnetic transition metal ions at the sites of the resonant ^1H nuclei. The recovery of the magnetization in the spin-lattice relaxation time (T_1) experiments was single-exponential.

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2 Acta Physica Polonica A

1 2015

1 2008

2 Kiss L.

1 Bokor M.

1 Bortel G.

1 Bujdosó L.

1 Kaptás D.

1 Kemény T.

1 Maťaš S.

1 Mihalik M.

1 Mitróová Z.

1 Tompa K.

1 Vincze I.

1 Zentko A.

1 Zentková M.

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

^1H NMR on (Ni_xMn_{1-x})_3[Cr(CN)_6]_2 · nH_2O