Amorphous microwires of high entropy alloys with large magnetocaloric effect

Microwires of Gd20Ho20Er20Al20TM20 (TM = Fe, Co and Ni) high-entropy metallic glasses (HE-MGs) are successfully fabricated by a melt-extraction method, which exhibit good magnetocaloric properties. The maximum magnetic entropy change and refrigerant capacity under 5 T of the Gd20Ho20Er20Al20Co20 HE-MG microwire can reach 10.2 J kg(-1) K-1 and 625 J kg(-1), respectively. In addition, the magnetocaloric properties of the HE-MG microwires can be widely tuned by doping different transition metals. The HE-MG microwires combining high heat-exchange efficiency and excellent mechanical properties are attractive candidates for applications in magnetic refrigeration.