Magnetocaloric Effect in Uncoated Gd55Al20Co25 Amorphous Wires

Enhanced Curie temperature and cooling efficiency in melt-extracted Gd50(Co69.25Fe4.25Si13B13.5)50 microwires

“…The fitted result is shown in Fig. 5a, which yields n = 0.77, in good agreement with those reported previously for the Gd-Al-Co microwires [16][17][18][19][20][21]. This value of n is also close to that reported previously for typical Fe-based amorphous alloys (n = 0.75) [34], but deviates from the mean-field theoretical value (n = 0.67) [33].…”

“…The amorphous structure of the microwires can also be predicted based on Inoue's three rules of thumb [26]: 1 ) 50 microwires is ~70 K higher than those of our previously reported Gd-Al-Co amorphous microwires (T C ~100 K) [16][17][18][19][20][21]. It has been reported that relative to GdCo binary alloys [28], the Al addition enhanced the MCE but reduced the Curie temperature in GdCoAl ternary alloys [29].…”

“…However, producing amorphous magnetic wires with diameters less than 1 mm using traditional fabrication techniques has remained a challenging task. Appling a precision homemade melt-extraction technique with greater quenching rates, we have been successful in preparing a new class of high quality Gd-based microwires such as GdCoAl that possess enhanced MCE and RC [16][17][18][19][20][21]. In these GdCoAl microwires, Al was used to enhance amorphous structure and hence MCE, but decreased the Curie temperature of the initial alloy.…”

The Magnetocaloric Composite Designed by Multi‐Gd‐Al‐Co Microwires with Close Performances

“…The wires with compositions of Gd 50 Al 25 Co 25 , Gd 55 Al 25 Co 20 , and Gd 60 Al 25 Co 15 were fabricated by the melt‐extracted method; details of which can be found in our previous reports . The MCE properties achieved for a magnetic field change (µ 0 Δ H ) of 5 T and transition temperatures of these wires are summarized in Table .…”

“…In our previous works, we have reported on the MCE of several GdAlCo melt‐extracted microwires that possess close performances and transition temperatures . The improvement of heat exchange effect between a refrigerant and the transfer liquid is important in a cooling system especially for amorphous magnetocaloric materials with low adiabatic temperature changes.…”