Abstract
The magnetic properties and magnetocaloric effect of Cu doping on HoNiAl (HoNi1−xCuxAl) have been investigated. Two transitions occurred for samples with x=0 and x=0.1 induced by the combination and competition between antiferromagnetic (AFM) and ferromagnetic (FM) orderings. Simple AFM orderings were found in samples with x=0.2 to x=0.7 while FM orderings were found in samples with x=0.8–1. The magnetocaloric effect (MCE) was investigated in selected samples with x=0.3 and 0.8. Large magnetic entropy changes (ΔSM) as −29.2J/kgK at 9K and −19.7J/kgK at 9K with corresponding refrigerant capacity (RC) of 299J/kg, 309J/kg for a field change of 0–50kOe were observed. The large ΔSM and RC without hysteresis loss indicated these materials attractive candidates for magnetic refrigeration in low temperature range.
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