The analysis of the magnetic properties in the intermetallic YxGd1−xNi3 compounds

Magnetism in the YxGd1−xFe3 system

“…The obtained values are lower than for pure iron (2.2 μ B ), which may be a result of weakening of exchange interaction confirmed by the A TT (x) dependence and MFT calculations. It is worth noting, that the obtained values of exchange coupling parameters are in a quite good agreement with previously estimated for RFe 3 compounds [1,2,7,19,24]. Moreover, all performed calculations have been done under the assumption that yttrium is non-magnetic.…”

“…In the previously studied Y x Gd 1 À x T 3 (T ¼Ni) [24] system we obtained quite different behavior of exchange coupling parameters. In the case of T ¼Ni as well as T ¼Fe with Gd/Y substitution the R -sublattice becomes magnetically less important but at the same time in the first series the interaction within T-sublattice (T ¼Ni) increases, which is in contrary to the second one (T ¼Fe).…”

“…Nickel which is almost non-magnetic or exhibits quite small magnetic moment ( $ 0.2 μ B ) induced by Gd5d polarization has only a slight influence on the magnetic properties. On the other hand iron has the magnetic moment almost ten times stronger than nickel ( $2.2 μ B ) and therefore the substitution of the non-magnetic yttrium in the 4f sublattice leads to more significant influence on the exchange coupling parameters than in the case of T¼ Ni [24]. The magnetic properties in the Y x Gd 1-x Ni 3 series are closely related to the 5d-3d hybridization, the transfer of electrons from the rare earth Gd(5d)/Y(4d) band to not filled 3d one and as a result the 5d/ 4d-3d hybridization which induce the magnetic moment on Ni atoms.…”

“…For the TmFe 3 compound the deviation from collinearity has been estimated as the largest. The analysis of the magnitude of f-d interactions based on the molecular field theory [2,7,19,24,25] indicates that the molecular field coefficients R-3d are stronger than R-R but weaker than the 3d-3d in all studied RFe 3 compounds except GdFe 3 and TbFe 3 . Furthermore, high Curie temperatures (T C ) confirm the dominant role of iron 3d exchange interactions.…”

“…Another of widely studied series is R(Fe 1 À x Ni x ) 3 (R¼Gd, Tb, Dy, Ho) system [1,4,9,10,13,14,[22][23][24]. All performed measurements allowed to examine the effect of increasing the concentration of 4f as well as 3d electrons on the magnetic ordering of these compounds.…”