Competing ferromagnetic and antiferromagnetic interactions drive the magnetocaloric tunability in Gd55Co30NixAl15−x microwires

We have employed Gd55Co30NixAl15−x (x = 10, 5 and 0) amorphous microwires as a model system to unravel the impact of multiple magnetic interactions on magnetism magnetocaloric behavior in Gd-alloy microwire systems. Our study shows that addition RKKY ferromagnetic (FM) interaction (Gd-Gd), antiferromagnetic (AFM) (Gd-Co, Gd-Ni) coexist contribute response system. The dilution effect Al element FM Gd-Gd is responsible for decrease Curie temperature (TC), whereas increase saturation magnetization (MS) originated from reduced AFM Gd-Ni interaction. A thorough analysis critical exponents suggests presence hinders exhibit long-range order below TC. Adjusting these shown preserve large refrigerant capacity (RC) while tuning TC over wide range, which desirable active refrigeration.