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We have studied the impact of structural disorder on the magnetic ordering and magnetocaloricresponse of amorphous Gd68Ni32and Gd53Al24Co20Zr3microwires. We find that the presence ofstructural disorder significantly broadens the paramagnetic to ferromagnetic (PM-FM) transitionand the temperature-dependent magnetic entropy change, while the nature of the second-ordermagnetic transition and long-range ferromagnetic order are not essentially affected by this effect.The large magnetic moment of Gd and the presence of the long-range ferromagnetic order arebelieved to result in a large magnetic entropy change, which together with the broadening of thePM-FM transition due to structural disorder contribute to a large refrigerant capacity. The excellentmagnetocaloric properties of the amorphous microwires make them very promising candidates foractive magnetic refrigeration

Impact of structural disorder on the magnetic ordering and magnetocaloric response of amorphous Gd-based microwires