Design of Fe-containing GdTbCoAl high-entropy-metallic-glass composite microwires with tunable Curie temperatures and enhanced cooling efficiency

•Nanocrystalline Fe-containing GdTbCoAl high-entropy-metallic-glass were attained.•Curie temperature is tuned by Fe-doping in a wide temperature range of 81–108 K.•Magnetic entropy change 7.6–8.9 J kg−1 K−1 for 5 T were achieved.•The dual-phase structure with TC distribution enhances the cooling efficiency.