Effect of Dy substitution in the giant magnetocaloric properties of HoB${}_2$

Abstract

Recently, a massive magnetocaloric effect near the liquefaction temperature of hydrogen has been reported in the ferromagnetic material HoB${}_2$. Here we investigate the effects of Dy substitution in the magnetocaloric properties of Ho${}_{1-x}$Dy${}_x$B${}_2$ alloys ($\text{x}$ = 0, 0.3, 0.5, 0.7, 1.0). We find that the Curie temperature ($\text{T}$${}_C$) gradually increases upon Dy substitution, while the magnitude of the magnetic entropy change |$\Delta {\text{S}}_M$| at $\text{T}$ = ${\text{T}}_C$ decreases from 0.35 to 0.15 J cm${}^{-3}$ K${}^{-1}$ for a field change of 5 T. Due to the presence of two magnetic transitions in these alloys, despite the change in the peak magnitude of |$\Delta {\text{S}}_M$|, the refrigerant capacity ($\text{RC}$) and refrigerant cooling power ($\text{RCP}$) remains almost constant in all doping range, which as large as 5.5 J cm${}^{-3}$ and 7.0 J cm${}^{-3}$ for a field change of 5 T. These results imply that this series of alloys could be an exciting candidate for magnetic refrigeration in the temperature range between 10-50 K.

19 pages, 5 figures, 2 tables

References in corpus (1)

• Machine Learning Guided Discovery of Gigantic Magnetocaloric Effect in HoB${}_2$ Near Hydrogen Liquefaction Temperature

Cited by in corpus (3)

• Designing magnetocaloric materials for hydrogen liquefaction with light rare-earth Laves phases
• Enhancement of giant refrigerant capacity in Ho${}_{1-x}$Gd${}_x$B${}_2$ alloys (0.1 $\le$ x $\le$ 0.4)
• Magnetocaloric effect for the topological semimetal Co${}_3$Sn${}_2$S${}_2$ due to the antiferromagnetic coupling of the bulk and surface spin-polarized phases