Salaheldeen Mohamed, Wederni Asma, Ipatov Mihail, Zhukova Valentina, Zhukov Arcady
Department of Polymers and Advanced Materials, Faculty of Chemistry, University of the Basque Country (UPV/EHU), 20018 San Sebastián, Spain.
Department of Applied Physics I, EIG, University of the Basque Country (UPV/EHU), 20018 San Sebastián, Spain.
Materials (Basel). 2023 Jul 29;16(15):5333. doi: 10.3390/ma16155333.
In the current work, we illustrate the effect of adding a small amount of carbon to very common CoMnSi Heusler alloy-based glass-coated microwires. A significant change in the magnetic and structure structural properties was observed for the new alloy CoMnSiC compared to the CoMnSi alloy. Magneto-structural investigations were performed to clarify the main physical parameters, i.e., structural and magnetic parameters, at a wide range of measuring temperatures. The XRD analysis illustrated the well-defined crystalline structure with average grain size (D = 29.16 nm) and a uniform cubic structure with A2 type compared to the mixed L2 and B2 cubic structures for CoMnSi-based glass-coated microwires. The magnetic behavior was investigated at a temperature range of 5 to 300 K and under an applied external magnetic field (50 Oe to 20 kOe). The thermomagnetic behavior of CoMnSiC glass-coated microwires shows a perfectly stable behavior for a temperature range from 300 K to 5 K. By studying the field cooling (FC) and field heating (FH) magnetization curves at a wide range of applied external magnetic fields, we detected a critical magnetic field (H = 1 kOe) where FC and FH curves have a stable magnetic behavior for the CoMnSiC sample; such stability was not found in the CoMnSi sample. We proposed a phenomenal expression to estimate the magnetization thermal stability, ΔM (%), of FC and FH magnetization curves, and the maximum value was detected at the critical magnetic field where ΔM (%) ≈ 98%. The promising magnetic stability of CoMnSiC glass-coated microwires with temperature is due to the changing of the microstructure induced by the addition of carbon, as the A2-type structure shows a unique stability in response to variation in the temperature and the external magnetic field. In addition, a unique internal mechanical stress was induced during the fabrication process and played a role in controlling magnetic behavior with the temperature and external magnetic field. The obtained results make CoMnSiC a promising candidate for magnetic sensing devices based on Heusler glass-coated microwires.
在当前工作中，我们阐述了向非常常见的基于CoMnSi赫斯勒合金的玻璃包覆微丝添加少量碳的效果。与CoMnSi合金相比，新合金CoMnSiC在磁性和结构性能方面出现了显著变化。进行了磁结构研究，以阐明在广泛的测量温度范围内的主要物理参数，即结构和磁性参数。XRD分析表明，与基于CoMnSi的玻璃包覆微丝的混合L2和B2立方结构相比，CoMnSiC具有明确的晶体结构，平均晶粒尺寸（D = 29.16 nm）以及均匀的A2型立方结构。在5至300 K的温度范围内以及在施加的外部磁场（50 Oe至20 kOe）下研究了磁行为。CoMnSiC玻璃包覆微丝的热磁行为在300 K至5 K的温度范围内表现出完美的稳定性。通过在广泛的施加外部磁场范围内研究场冷（FC）和场热（FH）磁化曲线，我们检测到一个临界磁场（H = 1 kOe），在该磁场下CoMnSiC样品的FC和FH曲线具有稳定的磁行为；而在CoMnSi样品中未发现这种稳定性。我们提出了一个现象学表达式来估计FC和FH磁化曲线的磁化热稳定性ΔM（%），并且在临界磁场处检测到最大值，此时ΔM（%）≈98%。CoMnSiC玻璃包覆微丝随温度具有良好的磁稳定性，这归因于添加碳引起的微观结构变化，因为A2型结构在温度和外部磁场变化时表现出独特的稳定性。此外，在制造过程中诱导出了独特的内部机械应力，其在控制随温度和外部磁场的磁行为方面发挥了作用。所获得的结果使CoMnSiC成为基于赫斯勒玻璃包覆微丝的磁传感装置的有前途的候选材料。
