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1.
The results of magnetic resonance studies on ferrimagnetic (GdxY1?x)Co2 compounds, both below and above the Curie points, are presented. The ferrimagnetic resonance measurements show that the effective g values can be described by using the Wangsness relation. The spectroscopic splitting factors of cobalt atoms are not composition dependent. In the paramagnetic range the thermal variation of the linewidth is not linear and the g values are a function of temperature. This behavior is analyzed in correlation with the magnetic data. 相似文献
2.
The results of paramagnetic measurements and EPR study on Gd(CoxNi1?x)2 compounds are presented. The data are discussed in the molecular field model. The reciprocal susceptibility follows a Néel-type variation. The thermal variation of gef values is analysed considering the Vangsness' relation for temperatures T >Tc. Finally, the EPR data are discussed in the correlation with those obtained from magnetic measurements. 相似文献
3.
We present the results of electrical resistivity measurements performed on 20Fe2O380[3B2O3(1?x)PbOxAuOv] glasses, with AuOv=K2O, Ca, As2O3 and GeO2. For a given temperature the electrical conductivity is linearly dependent on the fraction of ferrous ions. The experimental data are well described by using a model involving small polarons. 相似文献
4.
Chioncel L Sakuraba Y Arrigoni E Katsnelson MI Oogane M Ando Y Miyazaki T Burzo E Lichtenstein AI 《Physical review letters》2008,100(8):086402
We investigate the effects of electronic correlations in the full-Heusler Co2MnSi, by combining a theoretical analysis of the spin-resolved density of states with tunneling-conductance spectroscopy measurements using Co2MnSi as electrode. Both experimental and theoretical results confirm the existence of so-called nonquasiparticle states and their crucial contribution to the finite-temperature spin polarization in this material. 相似文献
5.
R. Tetean I.G. Deac E. Burzo A. Bezergheanu 《Journal of magnetism and magnetic materials》2008,320(14):e179-e182
Structural, magnetic, magnetoresistance and magnetocaloric studies on La2/3Sr1/3Mn1−xCoxO3 compounds were reported. The samples were prepared by the conventional ceramic method. X-ray analysis showed the presence of one phase only, in all studied samples. From electrical resistance measurements it was found that the samples show large negative magnetoresistance behavior. The magnetic measurements were performed in a large temperature range, 4.2–750 K and external magnetic fields up to 5 T. The adiabatic magnetic entropy changes, |ΔS|, were determined from magnetization data. Large magnetocaloric effect (MCE) has been obtained in all studied samples. 相似文献
6.
The results of magnetic measurements performed on 20Fe2O380[3B2O3(1?χ)PbOχAs2O3] glasses, in the temperature range 4.2 to 300 K are reported. By decreasing the temperature a downward curvature of reciprocal susceptibility is observed for T<50 K. The composition dependence of the paramagnetic Curie temperatures and Curie constants is discussed. 相似文献
7.
8.
The results of57Fe Mössbauer effect measurements and magnetic studies performed on Dy2Fe14C and Er2Fe14C compounds are reported. The magnetic contributions of different iron sites are estimated and compared with those of corresponding boron compounds. The magnetic behaviour of the studied compounds is analysed in the molecular field approximation considering a two sublattices ferrimagnet. 相似文献
9.
The results of magnetic measurements performed on Ni0.8Cu0.2-xGex solid solutions, with x ? 0.10 are reported. The saturation magnetization, Curie temperature and effective nickel moments decrease nearly linear when substituting Cu by Ge. The ferromagnetic resonance measurements show that the g values are not dependent on composition. Finally, the magnetic behaviour of nickel in these solid solutions is analysed. 相似文献
10.
The results of magnetic measurements and ferromagnetic resonance studies performed on U(Fe
x
Al1–x
)2 and U(Fe
y
Ni1–y
)2 compounds over a large temperature range are reported. The saturation magnetization decreases nearly linearly when substituting Fe by Al or Ni. In the composition range x<0.84 and y<0.81, the compounds are Pauli paramagnets, except in the region with y0.10. For UNi2 two types of magnetic behaviours are shown. This compound can be both a ferromagnet withT
c
=23.5 K and a Pauli paramagnet, depending on the crystal structure. Above the Curie temperatures, the reciprocal susceptibility for the compounds with x>0.84 and y>0.81 obeys a temperature dependence of the formX=X
o+C(T-)
–1. The effective iron moments decrease when substituting iron by nickel or aluminium. The ferromagnetic resonance measurements show that theg values are not composition-dependent. A linear variation of the mean iron magnetization with the exchange field is observed. Finally, the magnetic behaviour of iron in these compounds is analysed. 相似文献