Effect of Carbon Addition on Magnetic Order in Mn–Al–C Alloys

Tyrman, Muriel; Pasko, Alexandre; Perrière, Loïc; Etgens, V. H.; Isnard, O.; Mazaleyrat, F.

doi:10.1109/tmag.2017.2710639

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…The Al magnetic moments are small and contribute insignificantly to the total magnetization of the supercell. The magnetic moment of Mn in the calculation is in agreement with the empirical values (µMn≈2.4 µB at 1a site) obtained by [26]. In addition, the magnetic moments obtained in our calculation are comparable with the values reported by [13], in which µFe = 1.9 µB, µMn = 2.45 µB and µAl ≈ -0.06 µB.…”

Section: Ab Initio Calculationsupporting

confidence: 91%

Investigation on magnetic properties of mechanically alloyed τ-MnAlC with Fe addition

Nguyen

Mazaleyrat

Calvayrac

et al. 2022

Journal of Magnetism and Magnetic Materials

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The influence of Fe addition on thermal stability, crystallography, and magnetic properties of τ-Mn51Al47C2 was investigated. Alloys with composition 0.5,1,2,and 4) were synthesized by mechanical alloying method. High purity of τ-Mn(Fe)AlC up to 98% could be obtained after 10h of milling, then annealed at 1050 o C for 1h, and followed by an aging process at appropriate temperatures from 515 to 540 o C for 50 minutes. It was found that the thermal stability of both ε and τ phases was enhanced by the addition of Fe up to 4 at.% into MnAlC alloy through a shifting of ε-to-τ transformation temperature to high temperature region and a reduction in c/a ratio of Fe doped τ-MnAlC compared to iron free τ-MnAlC. While the magnetization and Curie temperature of Fe doped τ-MnAlC showed a reduction compared to iron free τ-Mn51Al47C2, coercivity seems not to be significantly affected.Ab initio calculation showed a lower magnetic moment of Fe (µFe = 1.77 µB) compared to Mn (µMn_average = 2.36 µB) in τ-Mn(Fe)AlC when Fe substituted Mn position at 1a site.

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Section: Ab Initio Calculationsupporting

confidence: 91%

Investigation on magnetic properties of mechanically alloyed τ-MnAlC with Fe addition

Nguyen

Mazaleyrat

Calvayrac

et al. 2022

Journal of Magnetism and Magnetic Materials

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“…It is then predicted that the excess of Mn from the 1d sites also couples antiferromagnetically with the Mn from the 1a sites. This was experimetally shown by Tyrman et al [49] by neutron diffraction. The magnetic moment of 1a site is between 2.4 and 2.7µ B ↑ (depending on Mn and C content) at RT and the one of 1d is about 3µ B ↓.…”

Section: E Intrinsic Magnetic Propertiessupporting

confidence: 65%

Getting Rid of Critical Raw Materials in Hard Magnets: Is it Feasible?

Mazaleyrat¹

2022

IEEE Trans. Magn.

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Hard Magnets are key components in the evolution of transportation technologies and renewable energies. In particular in automobile industry, the anticipated switch to full electric drive in the next 30 years will create a strong demand for magnets. Unfortunately, present high performance hard magnets uses critical elements, either rare-earth or cobalt, so we can foresee a big stress on the market. In this paper, we will review all existing hard magnets having functional properties adapted to automobile electric drives, the evolution of present material to reduce the critical elements content or to get rid of them. Finally a functional cost criteria will be set and discussed.

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“…Therefore, for the current study, we wanted to investigate the effect of adding carbon to the Co 2 MnSi alloy on the magneto-structural properties. Carbon addition, used to improve phase stability and coercivity, leads to the deformation of the unit cell and can affect the Mn-Mn coupling [17,18]. Thus, we present a primary investigation of magneto-structural properties of Co 2 MnSiC-based glass-coated microwires.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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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 (Dg = 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.

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Effect of Carbon Addition on Magnetic Order in Mn–Al–C Alloys

Cited by 5 publications

References 10 publications

Investigation on magnetic properties of mechanically alloyed τ-MnAlC with Fe addition

Investigation on magnetic properties of mechanically alloyed τ-MnAlC with Fe addition

Getting Rid of Critical Raw Materials in Hard Magnets: Is it Feasible?

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

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