Near room-temperature magnetocaloric effect of Co-based bulk metallic glass

Highlights: • Co₇₁Mo₉P₁₄B₆ BMG was prepared by combining fluxing treatment and J-quenching technique. • Co₇₁Mo₉P₁₄B₆ BMG exhibits a GFA with a maximum diameter of 4.5 mm. • The peak value of ΔS_M and the RC_FWHM of this Co-based BMG are 0.96 J kg⁻¹ K⁻¹ and 70.5 J kg⁻¹, respectively, under 5 T. • This Co-based BMG exhibits near room-temperature MCE with T_C of 317 K. Co₇₁Mo₉P₁₄B₆ bulk glassy rod with a maximum diameter of 4.5 mm is fabricated by combining fluxing treatment and J-quenching technique, and its magnetocaloric effect (MCE) has been investigated in the present work. The peak values of the magnetic entropy change and refrigerant capacity of the Co₇₁Mo₉P₁₄B₆ bulk metallic glass (BMG) are 0.96 J kg⁻¹ K⁻¹ and 70.5 J kg⁻¹, respectively, under a maximum applied field of 5 T. Most importantly, this BMG exhibits a Curie temperature of 317 K, which is suitable for room-temperature magnetic refrigeration. Combining the large glass-forming ability and near room-temperature MCE, the present Co₇₁Mo₉P₁₄B₆ BMG provides a candidate used as near room-temperature magnetic refrigerant.