Fe2MnSn – Experimental quest for predicted Heusler alloy

Kratochvílová, Marie; Král, Daniel; Dušek, Michal; Valenta, Jaroslav; Colman, R. H.; Heczko, Oleg; Veis, Martin

doi:10.1016/j.jmmm.2020.166426

Cited by 14 publications

(3 citation statements)

References 26 publications

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“…This spectral dependence resembles already reported results on polycrystalline Fe 48 Mn 24 Ga 28 [33] and Fe 50 Mn 25 Sn 25 [34] bulk samples. However, the spectra were completely different than those previously reported on other Heusler compounds containing Mn, but without Fe atoms, such as Ni-Mn-Ga [35,36], Ni-Mn-Sn, Ni-Mn-Sb, or other compounds containing Mn atoms [37].…”

Section: Magneto-optical Spectroscopysupporting

confidence: 90%

Magnetic and Magneto-Optical Properties of Fe75−xMn25Gax Heusler-like Compounds

et al. 2020

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Fe75−xMn25Gax Heusler-like compounds were investigated in a wide range of Fe/Ga ratios while keeping the Mn content constant and equal 25 at% in order to elucidate the interplay between magnetic properties and composition. Materials were prepared by arc-melting from pure elements and subsequently annealed. Experimental investigations were focused on magnetization behavior in a wide temperature range from 4 to 1000 K and magnetic field up to 9 T. Optical and magneto-optical (MO) measurements were employed to shed more light on the magnetic state and electronic structure of investigated materials. Magnetization measurements indicated that in the vicinity of stoichiometry (Fe2MnGa) the compounds are ferro/ferrimagnetic, whereas the Fe-deficient compound is paramagnetic and at high Fe concentration the antiferromagnetic interaction prevails. Theoretical calculations of corresponding ordered and disordered stoichiometric compounds were carried out and compared to the experiment on the level of net magnetic moment as well as magneto-optical spectra. This comparison suggests that the Heusler crystal structure, L21, is not present even close to stoichiometry. Moreover, the comparison of density of states (DOS) for ordered and disordered structures allowed us to explain missing martensitic transformation (MT) in investigated materials.

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Section: Magneto-optical Spectroscopysupporting

confidence: 90%

Magnetic and Magneto-Optical Properties of Fe75−xMn25Gax Heusler-like Compounds

et al. 2020

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“…[133] Although ab initio approaches can accurately reproduce the experimental results of Ni-Mn-X, it is difficult to predict the existence of new Heusler phases using different elements, even with perfect stoichiometry X 2 YZ. Recently, several attempts were made [161,162] to prepare theoretically predicted compounds, [163] but the success was limited. The calculations indicate that these Heusler phases can exist; however, other phases, such as binary, ternary, or some combination, may have lower energies, and thus, will form instead.…”

Section: Search For the Ground State Of Ni 2 Mngamentioning

confidence: 99%

Experimental Observations versus First‐Principles Calculations for Ni–Mn–Ga Ferromagnetic Shape Memory Alloys: A Review

Seiner

Zelený

Sedlák

et al. 2022

Physica Rapid Research Ltrs

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This review summarizes recent advances in first‐principles simulations of the structural, mechanical, and magnetomechanical properties of Ni–Mn–Ga‐based ferromagnetic shape memory alloys from the perspective of experimental characterization. It focuses on calculations that can capture the main features of the low‐temperature phases, particularly the appearance of spatial modulations, the occurrence of intermartensitic transitions, and the high mobility of the twin boundaries, which allows for magnetically induced reorientation. Although the calculations can only be used to interpret some of these features and are not yet ready to be used as a tool for designing new alloys with the required properties, the gap between experimental observations and simulations is narrowing. When experiments and theory are discussed together, new challenges arise for both. In addition, new results on first‐principles‐determined elastic constants of the 10M martensite of Ni–Mn–Ga are presented and discussed with respect to the high mobility of the twin boundaries.

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“…For applications in magnetics and spintronics [2], the inherently low magnetocrystalline anisotropy in cubic Heusler alloys can be limiting factor [8]. Identifying a hexagonal Heusler analogue [3] that retains half metallicity and exhibits a high magneto-crystalline anisotropy may be very attractive for applications such as perpendicular media, current perpendicular to plane giant magnetoresistance (CPP-GMR), and spin-torque-transfer RAM (STT-RAM) [9][10][11][12][13]. However, half-metallicity has been predicted for some Heusler analogues in the hexagonal DO 19 (P6 3 /mmc, space group no.…”

Section: Introductionmentioning

confidence: 99%

Tuneable structure and magnetic properties in Fe3−V Ge alloys

Mahat

Wines

et al. 2020

Journal of Alloys and Compounds

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We report a detailed experimental and theoretical study of the effects of V substitution for Fe atom on the structural, magnetic, transport, electronic and mechanical properties of an off-stoichiometric Fe 3− V Ge intermetallic alloy series (0 ≤ ≤ 1). Single phase microstructures are observed for < 0.75, whereas higher V content alloys ≥ 0.75 are multi-phased. Vanadium substitution is observed to induce a diffusionless martensitic phase transformation from a Heusler-like L2 1 structure to hexagonal DO 19 structure, as corroborated by Differential Scanning Calorimetry results. The vanadium substitution is also found to decreases the grain size, inhibiting the grain growth by pinning the grain boundary migration. All the alloys in the series are found to be soft ferromagnets at 5 K with saturation magnetic moment and Curie temperature decreasing as V concentration increases. The low temperature saturation magnetic moment is in close agreement with the expected Slater-Pauling values for the L2 1 phases, while the hexagonal samples have markedly higher values of saturation moments. First-principle calculations agree with the experimental findings and reveal that V substitution energetically favours one of the Fe sites in Fe 3 Ge. The electrical resistivity measured over the temperature range from 5 K to 400 K shows negative temperature coefficient of resistivity at high temperatures with increasing the V concentration. Relatively high mechanical hardness values are also observed, with the values increasing with increasing V content. Vanadium substitution is found to play a central role in tuning the mechanical properties, stabilising the L2 1 structure, and shifting the martensitic transformation temperature to higher values from that of parent Fe 3 Ge.

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Fe2MnSn – Experimental quest for predicted Heusler alloy

Cited by 14 publications

References 26 publications

Magnetic and Magneto-Optical Properties of Fe75−xMn25Gax Heusler-like Compounds

Magnetic and Magneto-Optical Properties of Fe75−xMn25Gax Heusler-like Compounds

Experimental Observations versus First‐Principles Calculations for Ni–Mn–Ga Ferromagnetic Shape Memory Alloys: A Review

Tuneable structure and magnetic properties in Fe3−V Ge alloys

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