Structural, magnetic, and magnetocaloric characterization of NiMnSn microwires prepared by Taylor-Ulitovsky technique

We report the structural, magnetic, and magnetocaloric characterization of glass-coated Ni(42.9)Mn(37.1)Sn(20.0 )microwires produced by the Taylor-Ulitovsky method. Microwire samples crystallized into a single-phase austenite with the L2(1)-type crystal structure (space group Fm3m, lattice parameter a asymptotic to 6.02 & Aring;) and a Curie temperature of 349 K. A distinctive feature of the produced microwires is that saturation magnetization is reached at a very low magnetic field (similar to 0.15 T). For a magnetic field change of 3 T, the produced microwires showed a reversible maximum magnetic entropy change |delta S-M|(max) of 2.3 J kg(-1) K-1 and a refrigerant capacity of 197 J kg(-1), which are similar to the values reported by other austenitic NiMnSn alloys produced by rapid quenching techniques.(c) 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/9.0000549

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We present the structural, magnetic, and magnetocaloric properties of glass-coated Ni(42.9)Mn(37.1)Sn(20.0) microwires fabricated by the Taylor-Ulitovsky technique. The microwire samples exhibit a single-phase austenite structure with a Curie temperature of 349 K. Notably, the microwires achieve saturation magnetization at a very low magnetic field (approximately 0.15 T). For a magnetic field change of 3 T, the microwires demonstrate a reversible maximum magnetic entropy change |delta S-M|(max) of 2.3 J kg(-1) K-1 and a refrigeration capacity of 197 J kg(-1), similar to those reported for other austenitic NiMnSn alloys produced by rapid quenching techniques.