Ni_2FeSi Heusler Glass Coated Microwires

Galdun, L.; Ryba, T.; Prida, V.M.; Hernando, B.; Zhukova, V.; Zhukov, A.; Vargová, Zuzana; Varga, R.

doi:10.12693/aphyspola.131.851

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…[52,53] Since there was a good experience producing Fe-Ni-Si-based amorphous microwires, [139] the first glass-coated microwires produced by the Taylor-Ulitovski method were based on Ni 2 FeSi composition. [140] The SEM and energy dispersive spectroscopy (EDX) chemical analysis revealed an average chemical composition of Ni 51 Fe 23.6 Si 25.4, which is with the variation of AE1% in good agreement with the expected one. The microwire showed a well-defined anisotropy having the easy axis parallel to the wire axis (Figure 4).…”

Section: Heusler Microwires With High Spin Polarizationsupporting

confidence: 62%

“…In the case of structural transition, the entropy change is even enhanced. [75] One of the best candidates [140] Co 2 FeSi, [62] and Co 2 MnGe glass-coated microwires measured in the parallel and perpendicular direction with respect to the long microwire axis.…”

Section: Heusler Microwires With Magnetocaloric Effectmentioning

confidence: 99%

“…Comparison of the magnetic hysteresis loops of Ni 2 FeSi, [ 140 ] Co 2 FeSi, [ 62 ] and Co 2 MnGe glass‐coated microwires measured in the parallel and perpendicular direction with respect to the long microwire axis.…”

Section: Heusler Microwiresmentioning

confidence: 99%

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Heusler‐Based Cylindrical Micro‐ and Nanowires

Hennel

Varga

Frolova

et al. 2022

Physica Status Solidi (a)

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Heusler alloys present a large group of binary, [1][2][3][4][5] ternary, [6][7][8][9][10] or quaternary [11][12][13][14] compounds with a wide variety of physical properties. [15][16][17][18] Thanks to their extensive tunability [19][20][21][22] based on their chemical composition, crystal, or electronic structure, [23][24][25][26][27][28][29] they attract interest in the fundamental and application approach. [30][31][32][33][34] Particularly, spin polarization, [33,35] superconductivity, [36][37][38][39] shape memory, [40][41][42][43][44][45] or magnetocaloric behavior [28,40,[46][47][48][49][50] have triggered significant interest in the experimental and theoretical perspective.Based on the chemical composition and the resulting properties, Heusler alloys, also known as full-Heusler alloys with the stoichiometry X 2 YZ, can be divided into several groups according to their physical properties. [51] Co 2 YZ-based Heusler can be considered the leading group of materials showing high spin polarization (P) or even half metallicity (P ¼ 100%). [52][53][54][55][56][57] However, theoretical and experimental studies point to the high sensitivity of spin polarization on the structural disorder. [58] Here, the L2 1 crystalline phase exhibits the highest structural ordering, essential for achieving the required spin polarization values. [59] In contrast, while the mutual exchange of the atoms on the Y-Z position (B2 disorder) has a low influence on the spin polarization values, the X-Y or X-Y-Z disorders (D0 3 or A2, respectively) may significantly decrease spin polarization values. [55,60,61] The presented disadvantage can be solved by a suitable chemical composition or a proper method of preparation of Heusler alloys. [62,63] Stoichiometric and off-stoichiometric Ni-Mn-Z- [64][65][66] and Ni-Fe-Z-based Heusler alloys [67][68][69] are well-known magnetocaloric, shape memory, or even magnetic shape memory materials. [70,71] The mentioned Heusler alloys undergo a structural transformation from a low-temperature martensitic phase to a high-temperature austenitic phase, [51,[64][65][66][72][73][74] which may significantly influence the magnetic entropy change ΔS M and the intensity of the magnetocaloric effect. [75,76] Additionally, Heusler alloys consist of cheap elements like Ni, Fe, Mn, Co, Ga, and In, and thus may be considered low-cost counterparts for typical magnetocaloric material based on Gd, Rh, or other rare-earth elements. [77][78][79][80][81] Another advantage of the Ni-Mn-Zand Ni-Fe-Z-based Heusler alloys consists in the tunability of their structural and magnetic properties. Depending on the

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Section: Heusler Microwires With High Spin Polarizationsupporting

confidence: 62%

Section: Heusler Microwires With Magnetocaloric Effectmentioning

confidence: 99%

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Heusler‐Based Cylindrical Micro‐ and Nanowires

Hennel

Varga

Frolova

et al. 2022

Physica Status Solidi (a)

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“…4) shows typical ferromagnetic behaviour with decreasing magnetization up to 640K. Above this temperature, magnetization starts to increase most probably due to the secondary crystallization that deteriorates the magnetic properties [15]. The irregular shape of the curve may be caused due to the annealing of the wire, which relieves the internal stresses in the metallic nucleus from the glass coating (under 640 K) [22].…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, they require further suitable thermal treatment for a long time (from several hours up to entirely weeks) for obtaining the correcthigh ordered phase [14]. It was shown earlier [15], that rapid quenching by Taylor-Ulitovsky technique offers the production of glass-coated metallic microwires without the necessity of long thermal treatments. This single-step method with a high quenching rate of up to 10 7 K/s allows to prepare in a short time (of the order of few minutes) up to kilometres of the wire [16].…”

Section: Introductionmentioning

confidence: 99%

Monocrystalline Heusler Co2FeSi alloy glass-coated microwires: Fabrication and magneto-structural characterization

Galdun

Ryba²,

Prida

et al. 2018

Journal of Magnetism and Magnetic Materials

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Large scale production of single crystalline phase of Heusler Co 2 FeSi alloy microwire is reported. The long microwire (~ 1 km) with the metallic nucleus diameter of about 2 µm is characterized by well oriented monocrystalline structure (B2 phase, with the lattice parameter a = 5.615 Å). Moreover, the crystallographic direction [101] is parallel to the wire´s axis along the entire length. Additionally, the wire is characterized by exhibiting a high Curie temperature (Tc > 800 K) and well-defined magnetic anisotropy mainly governed by shape. Electrical resistivity measurement reveals the exponential suppression of the electron-magnon scattering which provides strong evidence on the half-metallic behaviour of this material in the low temperature range.

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