The Wide Operating Temperature Range in the Magnetocaloric Composite Formed by RMn 2 Si 2 (R=Tm, Tb, and Dy) and HoCoSi Compounds

RMn 2 Si 2 (R = Tm, Dy, and Tb) and HoCoSi alloys, presenting multiple magnetic phase transitions (except for TmMn 2 Si 2 and HoCoSi) and large magnetocaloric effect (MCE), were physically mixed to produce a composite magnetic refrigerant. The used concentration of each alloy was 0.1(TmMn 2 Si 2 ) + 0.35(DyMn 2 Si 2 ) + 0.4(TbMn 2 Si 2 ) + 0.15(HoCoSi). X-ray diffraction and magnetization measurements were used to investigate the crystallographic and magnetic properties of the samples. The results indicate the maximum values of magnetic entropy change ( -Δ S_M^max ) of 4.6 J/kg K under magnetic field change (ΔH) of 50 kOe. A large table-like MCE was observed for the composite sample. The full width at half maximum of Δ S M peak (δT FWHM ) values reaches 60.4 K (ΔH = 20 kOe) and 67.2 K (ΔH = 50 kOe), which correspond to a respective Δ S M peak broadening of 230