Specific features of the properties of half-metallic ferromagnetic Heusler alloys Fe2MnAl, Fe2MnSi, and Co2MnAl

Коуров, Н. И.; Марченков, В. В.; Королев, А. В.; Stashkova, L. A.; Emelyanova, S. M.; Weber, H.W.

doi:10.1134/s1063783415040149

Cited by 38 publications

(21 citation statements)

References 19 publications

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“…Moreover, both sides of ribbons are identical as it was also obtained from both area and point EDX analysis. The Rietveld analysis resulted in lattice parameters, a, summarized in Table 2, along with some of the other theoretical [10,21,22,23] and experimental [24,25,26] results obtained for bulk samples. It is evident that the experimentally determined lattice parameters for both Heusler compositions are slightly higher compared to theoretical ones obtained for stoichiometric compositions and well ordered, defect-free structures.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Preparation Technology on Microstructural and Magnetic Properties of Fe2MnSi and Fe2MnAl Heusler Alloys

et al. 2019

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Microstructural and magnetic properties of the X2YZ, namely Fe2MnSi and Fe2MnAl, Heusler alloys have been studied from the viewpoint of technology for their production and for the Z element effect. First, arc melting was applied to produce button-type ingots from which samples in a form of 500 µm thick discs were cut. Second, planar flow casting technology yielded samples in a ribbon-form 2 mm wide and 20 μm thick. The checked area chemical compositions were in agreement with the nominal ones. Nevertheless, the darker square objects and smaller bright objects observed at the wheel side of the Fe2MnSi ribbon sample yielded higher Mn content at the expense of Fe. The X-ray diffraction patterns of all samples have indicated L21 structure with lattice parameters, 0.567 (1) nm for Fe2MnSi and 0.584 (1) nm for Fe2MnAl, being within an experimental error independent of production technology. On the other hand, the technology has markedly influenced the microstructure clearly pointing to the larger size of grains and grain boundaries in the disc samples. From the magnetic viewpoint, both alloys are paramagnetic at room temperature without visible influence of their production. On the contrary, the low-temperature behavior of the microscopic hyperfine parameters and the macroscopic magnetic parameters exhibits differences affected by both chemical composition and microstructure.

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Section: Resultsmentioning

confidence: 99%

“…The present value of spontaneous magnetization is smaller than experimentally obtained 74 Am 2 /kg (2.6 μ B /f.u.) [ 26 ], 61 Am 2 /kg (2.1 μ B /f.u.) [ 35 ], and also less than theoretically calculated ~3 μ B /f.u.…”

Section: Resultsmentioning

confidence: 99%

Influence of Preparation Technology on Microstructural and Magnetic Properties of Fe2MnSi and Fe2MnAl Heusler Alloys

et al. 2019

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“…Як свідчать результати дослідження структури литих стопів (рис. 2), за КТ в них присутні сліди орторомбічної (або 10М) мартенситної фази, яка має істотно менші намагнетованість і температуру Кюрі, ніж аустенітна фаза [8,16,30,31]. При охолодженні стопів вміст мартенситної фази зростає, що в свою чергу має спричинити зменшення вислідної намагнетованости стопу.…”

Section: результати та їх обговоренняunclassified

“…В половинних металах, якими є деякі зі ГС, провідність одного з каналів має активаційний характер завдяки існуванню щілини на рівні Фермі. Через це результуюча температурна залежність електроопору таких систем, які є половинними металами, може мати неґативний ТКЕ [29][30][31].…”

Section: рис 6 температурні залежності магнітної сприйнятливости лиunclassified

Effect of Crystal Structure on Transport and Magnetic Properties of Bulk Ni$_{2}$MnSn Heusler Alloys

Kudryavtsev¹,

Надутов²,

Uvarov³

et al. 2016

Metallofiz. Noveishie Tekhnol.

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“…Recently, Fe 2 Mn-based Heusler alloys have drawn widespread attention from both theoretical and experimental aspects [12][13][14][15][16][17]. Especially, Fe 2 MnZ (Z = Sn, Al, Si) alloys have been synthesized in experiment [18][19][20]. Among these alloys, Fe 2 MnAl is promising material since it is made up of common elements, which makes it possible to be widely used in various spintronics devices.…”

Section: Introductionmentioning

confidence: 99%

The Tunable Electronic, Magnetic and Curie Temperature by Co Doping Fe_2-xCo_xMnAl Alloys

Wei

Sun

et al. 2019

Acta Phys. Pol. A

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Using the spin-polarized relativistic Korringa-Kohn-Rostoker method, we study the electronic, magnetic, and Curie temperature of Fe2−xCoxMnAl alloys. Results indicate that the Fe2−xCoxMnAl alloys preserve the ferromagnetic metallic nature, and the spin polarization is close to 80% when the Co concentration attains to 30%. The calculated total magnetic moment increases linearly as the increase of Co doping concentration, only small changes are observed for Fe(A), Mn(B), and Fe(C) atomic magnetic moments, while for the Al atom, the magnetic moment always nearly approach to zero. The Heisenberg exchange calculations imply that the Co(A)-Mn(B) exchange plays a leading role in interactions, in contrast to the Mn(B)-Mn(B) exchange in pure Fe2MnAl. We further calculate the sum of exchange coupling parameters between the constituents, and evaluate the Curie temperature of Fe2−xCoxMnAl alloys. It is found that the Mn(B)-Mn(B) and Fe/Co(A)-Mn(B) coupling parameters increase evidently with the increase of Co content, and then leading to the Curie temperature above room temperature when the Co doping concentration is over 60%, the change is also in good consistence with calculated total magnetic moment.

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Specific features of the properties of half-metallic ferromagnetic Heusler alloys Fe2MnAl, Fe2MnSi, and Co2MnAl

Cited by 38 publications

References 19 publications

Influence of Preparation Technology on Microstructural and Magnetic Properties of Fe2MnSi and Fe2MnAl Heusler Alloys

Influence of Preparation Technology on Microstructural and Magnetic Properties of Fe2MnSi and Fe2MnAl Heusler Alloys

Effect of Crystal Structure on Transport and Magnetic Properties of Bulk Ni$_{2}$MnSn Heusler Alloys

The Tunable Electronic, Magnetic and Curie Temperature by Co Doping Fe_2-xCo_xMnAl Alloys

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Specific features of the properties of half-metallic ferromagnetic Heusler alloys Fe2MnAl, Fe2MnSi, and Co2MnAl

Cited by 38 publications

References 19 publications

Influence of Preparation Technology on Microstructural and Magnetic Properties of Fe2MnSi and Fe2MnAl Heusler Alloys

Influence of Preparation Technology on Microstructural and Magnetic Properties of Fe2MnSi and Fe2MnAl Heusler Alloys

Effect of Crystal Structure on Transport and Magnetic Properties of Bulk Ni$_{2}$MnSn Heusler Alloys

The Tunable Electronic, Magnetic and Curie Temperature by Co Doping Fe2-xCoxMnAl Alloys

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The Tunable Electronic, Magnetic and Curie Temperature by Co Doping Fe_2-xCo_xMnAl Alloys