Substitution and liquid quenching effects on magnetic and magnetocaloric properties of (Gd1-xTbx)12Co7

• (Gd1-xTbx)12Co7 compounds have been amorphidized by the melt-spinning technique.
• Amorphization of Gd-enriched samples increases the Curie temperature.
• In Gd-enriched melt-spun alloys, the Co atoms possesses a small magnetic moment.
• The Tb for Gd substitution causes the ferrimagnetic to asperomagnetic changes.
• Amorphization of Tb-rich compounds substantially improves their MCE properties.

The influence of rapid quenching from the melt on the magnetic and magnetothermal properties of the (Gd1-xTbx)12Co7 samples has been investigated. The melt-spun (Gd1-xTbx)12Co7 alloys are observed to exhibit a ferromagnetic-like behavior and increased TC values at low Tb concentration in comparison with crystalline counterparts. The amorphization is suggested to result in the appearance of a small magnetic moment on Co atoms in Gd-rich liquid-quenched alloys. In low magnetic fields, the melt-spun (Gd1-xTbx)12Co7 alloys with high Tb concentrations exhibit enhanced values of the isothermal entropy change and refrigerant capacity then the crystalline compounds of the same composition.

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