Annealing-induced softening and metamagnetictransition control in MnFePSi microwires

IF 4.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL Intermetallics Pub Date : 2025-03-14 DOI:10.1016/j.intermet.2025.108742
Mohamed Salaheldeen , Valentina Zhukova , James Rosero , Daniel Salazar , Arcady Zhukov
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Abstract

The effect of high-temperature annealing on the magnetic, morphological, and microstructural properties of MnFePSi glass-coated microwires (GCMWs) and bulk sample is studied. A comparative analysis is conducted to elucidate the direct influence of annealing at 1373 K on their physical characteristics. Notably, significant differences in magneto-structural behavior are observed between as-prepared GCMWs and the bulk alloy. For the bulk sample, annealing promotes homogenization and a decrease in the average grain size from 24 μm to 2 μm, as confirmed by SEM and XRD analyses. In contrast, a broader grain size distribution in MnFePSi GCMWs, ranging from 0.8 μm to 40 nm compared to the as-prepared sample's with relatively uniform size of 36 nm is induced by annealing. Additionally, annealing enhances the Fe2P phase content in both samples. The annealing process significantly affects magnetic properties of MnFePSi GCMWs. A notable reduction in coercivity (Hc) is observed, with a decrease in Hc from 761 Oe (as-prepared) to Hc = 46 Oe (annealed), as evaluated from the hysteresis (M − H) loop measured at T = 5 K. The as-prepared MnFePSi-GCMWs exhibit a unique metamagnetic phase transition in M − H loops measured at various temperatures (200 K–5 K). Conversely, the annealed GCMWs display a more uniform metamagnetic transition in M − H loops measured at T = 20 K and 5 K. Furthermore, as-prepared GCMWs exhibit multistep magnetic M − H loops below 100 K, which is absent in the annealed samples. This study underlines the substantial effect of the annealing on MnFePSi-GCMWs, enabling the tailoring of magnetic phenomena, such as metamagnetic phase transition, multistep magnetic behavior, and the control of magnetic response (hardening/softening). These tailored properties can be exploited in a wide range of applications based on glass-coated microwires.

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来源期刊
Intermetallics
Intermetallics 工程技术-材料科学:综合
CiteScore
7.80
自引率
9.10%
发文量
291
审稿时长
37 days
期刊介绍: This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.
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