Abstract
A novel class of magnetocaloric microwires composed of antiferromagnetic GdB6 nanocrystals embedded in an amorphous ferromagnetic Gd73.5Si13B13.5 matrix is reported. These composite microwires were created directly from a melt-extraction process. XRD, TEM, HRTEM and SAED confirm the formation of GdB6 nanocrystals (∼10 nm) in the amorphous Gd73.5Si13B13.5 matrix. As a second-order magnetic material, the Gd73.5Si13B13.5/GdB6 microwires exhibit an excellent magnetocaloric response, with a large magnetic entropy change ΔSM ∼6.4 J kg−1 K−1 at ∼120 K, a large temperature interval δTFWHM ∼130 K, and the large refrigerant capacity RC ∼890 J kg−1 for a field change of 5 T. Such microwires are a promising candidate for active magnetic refrigeration in the temperature range of 10–200 K.
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