Magnetocaloric effect in Co-based amorphous alloy Co90Nb10Ta3

Abstract

Abstract We have found that the Curie temperature (Tc) of Co-based amorphous alloy Co90Nb10Ta3 (Tc\u202f=\u202f360\u202fK) is much lower than many amorphous alloy systems. Through further research, we have found Co90Nb10Ta3 exists second-order ferromagnetic (FM) to paramagnetic (PM) phase transition near the Tc. Co90Nb10Ta3 amorphous alloy near the Tc has a larger magnetocaloric effect (MCE), under the ΔH\u202f=\u202f60 kOe, - Δ S M max =2.43\u202fJ\u202fkg−1K−1, relative cooling power (RCP) can reach 203.55\u202fJ/kg. Compared with Fe-B-Cr, Fe-Cr-Cu-Nb-Si-B, FeCoSiAlGaPCB and FeCrMoCuGaPCB amorphous alloy, the Co-Nb-Ta amorphous alloy has better properties. Co-Nb-Ta amorphous alloy has better mechanical and chemical properties than other amorphous alloys, it is a potential MCE material.