Magnetic properties and magnetocaloric effect of melt-spun Gd75(Co1−xFex)25 alloys

Observation of a Broadened Magnetocaloric Effect in Partially Crystallized Gd60Co40 Amorphous Alloy

“…In comparison with the table-like MCE in other alloys at analogous temperature ranges, such as Gd 55 Co 35 Mn 10 annealed at 600 K for 30 min (|∆S M | of 5.46 J•kg −1 •K −1 with a temperature range from 137 K to 180 K) [14] and fully crystallized Gd 55 Co 35 Ni 10 (620 K/30 min) ribbon (|∆S M | of 5.0 J•kg −1 •K −1 with a temperature range from 154 K to 214 K) [15], as listed in Table 1, the |∆S M | of the materials in this work are larger, but the temperature width of the plateau of |∆S M |-T is narrower. On another hand, when compared with single amorphous phase alloys, like Gd 75 (Fe 0.25 Co 0.75 ) 25 [24] and Gd 50 (Co 69.25 Fe 4.25 Si 13 B 13.5 ) 50 [25], the combined merits of larger or comparative |∆S M | and broader working temperature range can be observed in these Gd 60 Co 40 annealed samples. The MCE in a temperature range of 160-220 K can be used in the fields of space technology, medicine, biology, life sciences and more [14].…”

“…Gd-TM (TM = Co, Fe, Ni, and Mn) amorphous alloys with near-room temperature MCE have attracted more attention in recent years. Generally, the broadened |∆S M |-T profile can be observed in these materials, owing to the highly disordered structure of amorphous systems, which smears out the magnetic transition [1,11,15,[17][18][19][20][21][22][23][24][25][26]. In-situ crystallization treatment of the amorphous ribbons is also utilized to obtain multi-phase magnetic refrigerant, such as crystallized Gd 55 Co 35 Ni 10 ribbon containing Gd 4 (Co, Ni) 3 and Gd 12 (Co, Ni) 7 phases, and partially crystallized Gd 55 Co 35 Mn 10 with precipitation of the Gd 3 Co-type and Gd 12 Co 7 -type phases in the amorphous matrix, both of them possess broadened table-like MCE [14,15].…”