Influence of Mn Doping on Magnetic and Structural Properties of Co_2FeSi Heusler Alloy

Galdun, L.; Ryba, T.; Kováč, J.; Prida, V.M.; Hernando, B.; Vargová, Zuzana; Varga, R.

doi:10.12693/aphyspola.131.866

Cited by 5 publications

(5 citation statements)

References 11 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%

“…[ 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 ]…”

Section: Introductionmentioning

confidence: 99%

“…[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.…”

mentioning

confidence: 99%

“…Figure 4. 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.…”

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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 Magnetocaloric Effectmentioning

confidence: 99%

“…[ 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 ]…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

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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“…61 However, there are some experimental works dealing with the magnetic properties of Co 2 Fe-based Heusler alloys having similar compositions. Alloys in the form of bulk that were prepared by means of different experimental methods like electrochemical deposition (Co 2 FeSn), 62 arc melting (Co 2 FeSi), 63 and melt spinning (Co 2 FeSi) 64 exhibit a comparable soft ferromagnetic behavior with low H C values ranging up to 100 Oe.…”

Section: Sio 2 Cover Layer By Atomic Layer Depositionmentioning

confidence: 99%

Intermetallic Co₂FeIn Heusler Alloy Nanowires for Spintronics Applications

Galdun

Vega

Vargová³

et al. 2018

ACS Appl. Nano Mater.

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Cylindrical Co2FeIn Heusler alloy nanowires are synthesized via template-assisted electrochemical deposition into the hexagonally self-ordered nanopores of hard-anodic alumina membranes. The electroplated nanowires, with 180 ±20 nm in diameter and around 14.5 µm in length, exhibit a polycrystalline nature and they are homogenous in composition. High-resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED) and Xray diffraction (XRD) analysis confirmed a cubic A2 disordered phase of the ferromagnetic Heusler compound, with a lattice parameter of a = 5.764 ± 0.001 Å. In addition, these structural characterizations reveal that the Co2FeIn nanowires display a polycrystalline structure with a pronounced {220} texture. The temperature dependent magnetization behavior and anisotropy field distribution calculations display a dominant role of shape, magnetocrystalline and magnetoelastic terms on the effective magnetic anisotropy of Co2FeIn alloyed nanowire arrays. Magneto-optical Kerr effect measurements performed on single freestanding nanowires, after releasing from the hosting alumina templates, confirmed competing behavior between shape and magnetocrystalline anisotropy contributions, which lead to complex magnetization reversal process. This fabrication technique offers a promising and new forward-looking synthesis of novel Heusler nanomaterials for spintronics applications.

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