Abstract
Magnetic and magnetocaloric properties of HoFe1−xCoxAl (x = 0, 0.3) were investigated. Both HoFeAl and HoFe0.7Co0.3Al undergo a second-order ferromagnetic (FIM) to paramagnetic (PM) transition at Curie temperatures (TC) of 87 and 82 K, respectively. The magnetocaloric effect is improved by the introduction of Co in HoFeAl compound. For a field change from 0 to 5 T, the maximum values of magnetic entropy change (−ΔSM) are 7.0 J·kg−1·K−1 for HoFeAl and 8.6 J·kg−1·K−1 for HoFe0.7Co0.3Al. In addition, the refrigerant capacity (RC) is enhanced largely from 416.2 J·kg−1 for HoFeAl to 561.9 J·kg−1 for HoFe0.7Co0.3Al. This large RC is attributed to the large ΔSM and the wide temperature span of ΔSM peak in HoFe0.7Co0.3Al compound. The physical mechanism of improvement in magnetocaloric effect by Co substitution in HoFeAl was also discussed in detail.
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