Magnetic and magnetocaloric properties of HoFe_(1-x)Co_(x)Al(x = 0, 0.3) were investigated. Both HoFeAl and HoFe_(0.7)Co_(0.3) Al undergo a second-order ferromagnetic(FIM) to paramagnetic(PM) transition at Curie tempe...Magnetic and magnetocaloric properties of HoFe_(1-x)Co_(x)Al(x = 0, 0.3) were investigated. Both HoFeAl and HoFe_(0.7)Co_(0.3) Al 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(﹣△SM)are 7.0 J·kg^(-1)·K^(-1) for HoFeAl and 8.6 J·kg^(-1)·K^(-1) for HoFe_(0.7)Co_(0.3) Al. In addition, the refrigerant capacity(RC)is enhanced largely from 416.2 J·kg^(-1) for HoFeAl to561.9 J·kg^(-1) for HoFe_(0.7)Co_(0.3) Al. This large RC is attributed to the large ﹣?SM and the wide temperature span of ?SM peak in HoFe_(0.7)Co_(0.3) Al compound. The physical mechanism of improvement in magnetocaloric effect by Co substitution in HoFeAl was also discussed in detail.展开更多
基金financially supported by the Fundamental Research Funds from National Institute of Metrology(Nos.35-ALC1514-15 and 35-AHY1323-13)the National Natural Science Foundation of China(No.51402031)。
文摘Magnetic and magnetocaloric properties of HoFe_(1-x)Co_(x)Al(x = 0, 0.3) were investigated. Both HoFeAl and HoFe_(0.7)Co_(0.3) Al 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(﹣△SM)are 7.0 J·kg^(-1)·K^(-1) for HoFeAl and 8.6 J·kg^(-1)·K^(-1) for HoFe_(0.7)Co_(0.3) Al. In addition, the refrigerant capacity(RC)is enhanced largely from 416.2 J·kg^(-1) for HoFeAl to561.9 J·kg^(-1) for HoFe_(0.7)Co_(0.3) Al. This large RC is attributed to the large ﹣?SM and the wide temperature span of ?SM peak in HoFe_(0.7)Co_(0.3) Al compound. The physical mechanism of improvement in magnetocaloric effect by Co substitution in HoFeAl was also discussed in detail.
