ScholarWorks@성균관대학교

초록

Mn-based Magnetocaloric alloys are promising candidates for solid-state cooling due to their magnetostructural transition properties. Understanding the composition-dependent structural and magnetic properties is crucial for optimizing their performance. This study investigates Mn-based quinary alloys using combinatorial synthesis and high-throughput screening to systematically explore their magneto-structural behavior. Combinatorial thin film libraries were synthesized for the composition range of Mn16–38Ni8–43Fe8–26Si20–49Al0.24–2.5, and analyzed using high-throughput X-ray diffraction (HT-XRD) and magneto-optic Kerr effect (MOKE) techniques. A composition-dependent transition between a mixed orthorhombic-hexagonal ferromagnetic (FM) phase and a hexagonal paramagnetic (PM) phase was observed at room temperature. The stability of the FM phase was found to correlate with high values of α ((Mn+Ni+Fe)/Si) and β ((Ni+Fe)/Mn). Machine learning analysis employing SHapley Additive exPlanations (SHAP) identified Mn concentration as the primary factor driving paramagnetism, while Fe and Ni concentrations were significant factors promoting ferromagnetic ordering. © 2025 Elsevier B.V.

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