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Magnetic Properties of Co_2MnSi Compound with Tb Impurities

100%
Grasin R., Rusu C., Vinteler E., Tetean R.
Acta Physica Polonica A
|
2012
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vol. 121
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issue 5-6
1128-1131
EN
In this paper we report our experimental and theoretical studies on the effect of Tb impurity on the magnetic properties of the Heusler half metallic ferromagnet Co_2MnSi. The analysis of the band structures of the doped alloy shows that the half-metallic properties are completely conserved if Tb substitute Mn atoms, this effect being determined through the coupling between the R(4f) spin with the Mn(3d) itinerant electron spins. We evaluate the strength of such a coupling by calculating, in an ab initio fashion, the total energy of Co_{16}Mn_7TbSi_8 compound for a parallel and antiparallel f-d coupling. The experimental magnetic moments are in good agreement with the calculated ones in case of ferrimagnetic ordering.
2
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Low Temperature Magnetic Properties of Pr_{0.7}(Ca,Sr)_{0.3}CoO_{3} Oxides

88%
Deac I., Vlădescu A., Balasz I., Tunyagi A., Tetean R.
Acta Physica Polonica A
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2011
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vol. 120
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issue 2
306-310
EN
We have investigated magnetic and magnetocaloric properties of Pr_{0.7}(Ca_{1-x}Sr_{x})_{0.3}CoO_{3}, when the average size of the interpolated cation was changed. Pr_{0.7}Ca_{0.3}CoO_{3} has an orthorhombic Pnma symmetry and it shows a magnetic cluster-glass behavior below 70 K. When Sr partially replaces Ca in this compound, its magnetic properties are improved, and it begins to have ferromagnetic-like behavior. The magnetic transition temperature, gradually, increases with increasing Sr content, up to 170 K, for x=1. The electrical conduction also improved when Sr content increased. All the samples show negative magnetoresitance. Magnetic entropy change ΔS_{M} was estimated from isothermal magnetization data. We have found that it had higher values for the samples with x>0.5, around 1 J/kg K for Δ B=4 T, with reasonable good relative cooling power.
3
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The Effect of Gd Impurities on the Physical Properties of Half-Metallic Ferromagnet Co_2MnSi

76%
Grasin R., Vinteler E., Bezergheanu A., Rusu C., Pacurariu R., Deac I., Tetean R.
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issue 4
648-651
EN
In this paper we report our experimental and theoretical studies on the effect of Gd impurity on the physical properties of the Heusler half-metallic ferromagnet Co_2MnSi. The analysis of the band structures of the doped alloy shows that the half-metallic properties are completely conserved if Gd substitutes Mn atoms. This effect is not determined by the spin-orbit interaction, but through the coupling between the R(4f) spin with the Mn(3d) itinerant electron spins. We evaluate the strength of such a coupling by calculating, in an ab initio fashion, the total energy of Co_{16}GdMn_7Si_8 compound for a parallel and antiparallel f-d coupling. The obtained magnetic moments of Co or Mn sites are in good agreement with the experimental ones.
4
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Magnetic and Electronic Properties of GdNi_{5-x}Al_{x} Intermetallic Compounds

76%
Coldea M., Chiuzbaian S. G., Neumann M., Todoran D., Demeter M., Tetean R., Pop V.
Acta Physica Polonica A
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2000
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vol. 98
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issue 5
629-632
EN
X-ray photoelectron spectroscopy and magnetic susceptibility of GdNi_{5}, GdNi_{4}Al, GdNi_{2}Al_{3} and GdNiAl_{4} are reported. The magnetic state of Ni 3d-electrons strongly depends on the crystallographic structure of the compounds, showing spin fluctuations in GdNi_{5} and GdNi_{4}Al, a similar behavior with that of metallic Ni in GdNi_{2}Al_{3} and a filled 3d-band in GdNiAl_{4}.
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