Abstract
Magnetic properties and magnetocaloric effect in (Fe0.76−xTmxB0.24)96Nb4 (x=0, 0.01, 0.05, 0.1, 0.17 and 0.18) metallic glasses have been studied. The appropriate substitution of Fe by Tm increases the glass-forming ability of the alloys and allows tuning the Curie temperature (TC) to near room temperature. A linear relationship between magnetic entropy change and saturation magnetization has been observed. The formation of minority nanocrystalline Tm2Fe14B1 phase has been observed at higher Tm additions, which could influence the magnetocaloric effect of the alloy. These Tm doped Fe-based alloys, with enhanced thermal stability, good magnetocaloric responses and tunable TC, are good candidates for near room-temperature magnetic refrigerants.
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