Magnetocaloric effect in uncoated Gd55Al20Co25 amorphous wires

Abstract

The Gd55Al20Co25 amorphous wires exhibit a relatively strong magnetocaloric effect (MCE). These melt-extracted amorphous wires display second-order magnetic transition (SOMT) and the value of maximal magnetic entropy (-ΔSm) for the melt-extracted wires is calculated to be ∼9.7 J•kg-1•K-1 around the Curie point (TC) of ∼110 K with applied field of 5 T. Moreover, the melt-extracted amorphous wires show a high refrigerating efficiency with a relatively large cooling power (RCP, ∼804 J•kg-1) and refrigeration capacity (RC, ∼580 J•kg-1) under an applied magnetic field of 5T due to the broad cparamagnetic-ferromagnetic (PM-FM) region associated with amorphous alloys. These favorable properties make melt-extracted Gd-based amorphous wires to be the potential refrigerant for magnetic refrigeration (MR) of liquid oxygen.