Transition temperature tuning of Ni2FeGa based Heusler alloys in form of glass-coated microwires

Hennel, M.; Galdun, L.; Ryba, T.; Varga, R.

doi:10.1016/j.jmmm.2020.166973

Cited by 10 publications

(14 citation statements)

References 33 publications

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“…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%

Section: Heusler Microwires With Shape Memory Effectmentioning

confidence: 99%

“…[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.…”

mentioning

confidence: 99%

“…chemical composition and the valence electron concentration (e/a), it is possible to adjust the temperature of the first-order (structural transformation) and the second-order magnetic (Ferro-para) transformation. [75,[82][83][84][85][86][87][88] Thus, it is possible to obtain significant magnetic entropy change at certain conditions by overlapping both firstand second-order transformations. [89][90][91][92] The crucial point for application is the production of Heusler alloys and the posttreatment of material to the final shape.…”

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confidence: 99%

“…Another advantage of this fabrication process is the winding of the microwires on a coil during the production process, which enables easy implementation of microwires into the technological process of preparing SMARTified components. [75,107,[111][112][113][114][115][116][117][118] Nanowires with the chemical composition corresponding to Heusler alloys can be obtained through several methods. Molecular-beam epitaxy (MBE) was used to prepare core-shell nanowires from a binary Fe 3 Si Heusler alloy and GaAs alloy suitable for spintronic applications.…”

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confidence: 99%

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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 Magnetocaloric Effectmentioning

confidence: 99%

Section: Heusler Microwires With Shape Memory Effectmentioning

confidence: 99%