In this paper structure, magnetic and magneto-thermal properties: magnetic entropy change (Δ) and refrigeration capacity () of ErY(CoFe)alloys (= 0, 0.2, 0.4, 0.6, 0.8, 1) in magnetic fields up to 90 kOe in a temperature range of 5-360 K are investigated. An analysis of temperature dependences of magnetization () and high-field susceptibility () showed that in these compounds, three different ferri- and a one ferromagnetic structures are consequently realized. Concentration dependences of magnetic moment at 5 K (), Curie temperature (), residual magnetization () and coercivity () have been shown to have an extreme at intermediate Y concentration. The character of temperature dependence of magnetic entropy change (Δ()) depends on the composition and originates from the type of magnetic structure of the compound and the mutual orientation of R- and 3d- element sublattices magnetization with respect to the resulting one. In compounds with= 0.6 and= 0.8 temperature regions with different signs of Δare observed, reflecting the change of dominating R- or 3d- sublattice in the resulting magnetization.
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