Tailorable magnetocaloric effect by Fe substitution in Gd-(Co, Fe) amorphous alloy

Abstract The magnetocaloric properties of Gd 70 Co 30- x Fe x ( x  = 0, 5, 10) amorphous ribbons were measured, analyzed and compared with the reported experimental data of Gd 50 Co 50- x Fe x ( x  = 0, 2, 5) and Gd 60 Co 40- x Fe x ( x  = 0, 5, 10) amorphous alloy series. The results show that the magnetocaloric effect (MCE) of Gd-(Co, Fe) amorphous alloys could be tuned on the basis of following mechanism: the magnetic transition temperature ( T C ) of the Gd-(Co, Fe) amorphous alloys linearly increases about 22 ± 2 K with every substitution of 5 at% Fe for Co, and the maximum magnetic entropy change |Δ S M pk | of each alloy series nearly linearly depends on the T C −2/3 . Additionally, the Gd-(Co, Fe) amorphous alloys with higher Fe content exhibit the table-like MCE and higher value of exponent n ( T pk ) ( | Δ S M p k | ∝ H n ( T p k ) ).