Carbon-Doped Co2MnSi Heusler Alloy Microwires with Improved Thermal Characteristics of Magnetization for Multifunctional Applications

Mohamed Salaheldeen; Asma Wederni; Mihail Ipatov; Valentina Zhukova; Arcady Zhukov

doi:10.3390/ma16155333

Carbon-Doped Co₂MnSi Heusler Alloy Microwires with Improved Thermal Characteristics of Magnetization for Multifunctional Applications

Materials (Basel). 2023 Jul 29;16(15):5333. doi: 10.3390/ma16155333.

Authors

Mohamed Salaheldeen^{1

2

3

4}, Asma Wederni^{1

2

4}, Mihail Ipatov^{1

2}, Valentina Zhukova^{1

2

4}, Arcady Zhukov^{1

2

4

5}

Affiliations

¹ Department of Polymers and Advanced Materials, Faculty of Chemistry, University of the Basque Country (UPV/EHU), 20018 San Sebastián, Spain.
² Department of Applied Physics I, EIG, University of the Basque Country (UPV/EHU), 20018 San Sebastián, Spain.
³ Physics Department, Faculty of Science, Sohag University, Sohag 82524, Egypt.
⁴ EHU Quantum Center, University of the Basque Country (UPV/EHU), 20018 San Sebastián, Spain.
⁵ IKERBASQUE-Basque Foundation for Science, 48011 Bilbao, Spain.

Abstract

In the current work, we illustrate the effect of adding a small amount of carbon to very common Co₂MnSi Heusler alloy-based glass-coated microwires. A significant change in the magnetic and structure structural properties was observed for the new alloy Co₂MnSiC compared to the Co₂MnSi 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_g = 29.16 nm) and a uniform cubic structure with A2 type compared to the mixed L2₁ and B2 cubic structures for Co₂MnSi-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 Co₂MnSiC 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 Co₂MnSiC sample; such stability was not found in the Co₂MnSi 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 Co₂MnSiC 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 Co₂MnSiC a promising candidate for magnetic sensing devices based on Heusler glass-coated microwires.

Keywords: HR-TEM; Heusler alloys; glass-coated microwires; magnetic sensing; thermal stability.

Abstract

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