Co-based full heusler alloy nanowires: Modulation of static and dynamic properties through deposition parameters

Sharma, Monika; Das, Anindita; Kuanr, Bijoy K.

doi:10.1063/1.5130036

Cited by 8 publications

(9 citation statements)

References 30 publications

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“…[135] The presented easy and low-cost preparation process allows the synthesis of Heusler nanowires or nanodiscs with different diameters (from hundreds to tens of nanometers). [124][125][126]129,136] To be able to synthesize the nanowires in the AAO membrane, it is necessary to produce nanocontacts on one side of the membrane (Figure 3b). At first, a thin layer of gold is formed using sputtering.…”

Section: Micro-and Nanowires Fabricationmentioning

confidence: 99%

“…[ 135 ] The presented easy and low‐cost preparation process allows the synthesis of Heusler nanowires or nanodiscs with different diameters (from hundreds to tens of nanometers). [ 124–126,129,136 ]…”

Section: Micro‐ and Nanowires Fabricationmentioning

confidence: 99%

“…[ 60 ] Because of that, there are known several attempts to fabricate Co 2 ‐based Heusler nanowires. [ 121,122,126,130,136,178,179 ]…”

Section: Heusler Nanowiresmentioning

confidence: 99%

“…One of the most suitable Heusler alloy nanowires' preparation technique employs anodized aluminum oxide (AAO) membrane as an electrodeposition template. [97,[124][125][126][127][128][129][130] The disadvantage of this method amounts to the optimization of the electrodeposition conditions, which may be time-consuming. In contrast, the prepared nanowires have a homogeneously distributed behavior and exhibit a uniform morphology.…”

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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: Micro-and Nanowires Fabricationmentioning

confidence: 99%

Section: Micro‐ and Nanowires Fabricationmentioning

confidence: 99%

“…[ 60 ] Because of that, there are known several attempts to fabricate Co 2 ‐based Heusler nanowires. [ 121,122,126,130,136,178,179 ]…”

Section: Heusler Nanowiresmentioning

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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“…Co 2 -based Heusler alloys are well known for their high saturation magnetization and Curie temperature, which are the essential requirements for spintronic devices or magnetic-based memories . Even though it is a hot topic, the fabrication of Co 2 -based Heusler nanowires is not a trivial task, and only a few scientific papers deal with this issue. − The nanowires (NWs) may exhibit strong perpendicular magnetic anisotropy for spintronic applications but usually with the lack of spin polarization characterization . There is still a strong demand for the preparation of next-level 3D magnetic “racetrack” memory devices.…”

Section: Introductionmentioning

confidence: 99%

High Spin Polarization in Co₂FeSn Heusler Nanowires for Spintronics

Galdun

Szabó

Vega

et al. 2020

ACS Appl. Nano Mater.

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Cylindrical nanowires made of Co2FeSn Heusler alloy with high spin polarization have been synthetized via template-assisted electrochemical deposition in nanoporous anodic alumina membranes. Their microstructure and morphology have been characterized by in situ studies of X-ray diffraction, together with scanning and transmission electron microscopy techniques. The basic structural and magnetic characterization revealed a B2-type cubic ordered Heusler structure with a lattice parameter of around 5.8 Å and the [110] direction, preferably aligned with the longitudinal axis of the polycrystalline nanowires. The easy magnetization axis is parallel to the nanowire’s axis too. The point-contact Andreev reflection spectroscopic measurements performed on the nanowire’s fresh surface released high polarization values, that is, P = 0.85–1, and prove that the high spin polarization or half-metallicity will be preserved in the nanoscale regime. The presented results open the possibilities toward future exploration of Heusler nanowires with high spin polarization, which are promising materials for applications in spintronics and high-density magnetic data recording.

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