High Spin Polarization in Co<sub>2</sub>FeSn Heusler Nanowires for Spintronics

Galdun, L.; Szabó, P.; Vega, V.; Castro, Emilio Mata de; Mendoza-Reséndez, Raquel; Luna, Carlos; Kováč, J.; Milkovič, Ondrej; Varga, R.; Prida, V.M.

doi:10.1021/acsanm.0c01024

Cited by 31 publications

(34 citation statements)

References 52 publications

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“…Nanowires represent a distinctive category of 1D nanostructures, thoroughly investigated due to their highly anisotropic shape (diameters of 1–100 nm and lengths up to tens of micrometers), being suitable for applications in different areas such as optoelectronics, spintronics, photocatalisys, sensing, biotechnology, etc. 10 – 13 . Semiconductor nanowires have been widely explored as novel building blocks for advanced miniaturized optoelectronic devices, easily finding applications in field effect transistors 14 , 15 , solar cells 16 , light emitting diodes 17 , photodetectors 18 , 19 , photoelectrochemical water splitting 20 , etc.…”

Section: Introductionmentioning

confidence: 99%

Self-connected CuO–ZnO radial core–shell heterojunction nanowire arrays grown on interdigitated electrodes for visible-light photodetectors

Costas

Florica

Preda

et al. 2022

Sci Rep

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An original photodetector system based on self-connected CuO–ZnO radial core–shell heterojunction nanowire arrays grown on metallic interdigitated electrodes, operating as visible-light photodetector was developed by combining simple preparation approaches. Metallic interdigitated electrodes were fabricated on Si/SiO2 substrates using a conventional photolithography process. Subsequently, a Cu layer was electrodeposited on top of the metallic interdigitated electrodes. The CuO nanowire arrays (core) were obtained by thermal oxidation in air of the Cu layer. Afterwards, a ZnO thin film (shell) was deposited by RF magnetron sputtering covering the surface of the CuO nanowires. The morphological, structural, compositional, optical, electrical and photoelectrical properties of the CuO nanowire arrays and CuO–ZnO core–shell nanowire arrays grown on metallic interdigitated electrodes were investigated. The performances of the devices were evaluated by assessing the figures of merit of the photodetectors based on self-connected CuO–ZnO core–shell heterojunction nanowire arrays grown on the metallic interdigitated electrodes. The radial p–n heterojunction formed between CuO and ZnO generates a type II band alignment that favors an efficient charge separation of photogenerated electron–hole pairs at the CuO–ZnO interface, suppressing their recombination and consequently enhancing the photoresponse and the photoresponsivity of the photodetectors. The electrical connections in the fabricated photodetector devices are made without any additional complex and time-consuming lithographic step through a self-connecting approach for CuO–ZnO core–shell heterojunction nanowire arrays grown directly onto the Ti/Pt metallic interdigitated electrodes. Therefore, the present study provides an accessible path for employing low dimensional complex structures in functional optoelectronic devices such as photodetectors.

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Section: Introductionmentioning

confidence: 99%

Self-connected CuO–ZnO radial core–shell heterojunction nanowire arrays grown on interdigitated electrodes for visible-light photodetectors

Costas

Florica

Preda

et al. 2022

Sci Rep

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“…However, the given behavior has been observed only at the temperature interval below 88 K. [63] The second studied composition was Co 2 MnGe, in which the theoretical studies have predicted 100% spin polarization and high Curie temperature (T C ¼ 1012 K). [141] The magnetic [124] Copyright 2020 American Chemical Society; c) AAO membrane with electrodeposited nanowires; d) SEM micrograph of the top view of the AAO membrane; and e) the SEM cross-section image showing the nanowire array grown from the gold nanocontacts (white). hysteresis loops measured in both parallel and perpendicular orientation with respect to the wire's axis show well-defined anisotropy with the easy axis parallel to the wire axis (Figure 4).…”

Section: Heusler Microwires With High Spin Polarizationmentioning

confidence: 99%

“…Another attempt for the preparation of Co 2 Fe-based Heusler alloys gave rise to the Co 2 FeSn nanowires with even lower diameters (60 nm). [124] The nanowires have been prepared analogically to the case of Co 2 FeIn except for the deposition Reproduced with permission. [194] Copyright 2022, IOP Publishing, Ltd.…”

Section: Co 2 Feinmentioning

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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“…These nanoparticles are normally synthesized by chemical methods [ 5 ] that are easily scaled-up, enabling real world applications [ 6 ]. Nanowires (NWs), which are much less widespread in applications than nanoparticles, have emerged in recent years, as nanomaterials have been called upon to play an important role in the development of breakthrough technologies in many fields, such as novel computation and data recording schemes [ 7 , 8 ], neuroscience [ 9 , 10 ], drug delivery [ 11 , 12 ], chemical sensing [ 13 , 14 ] or water splitting [ 15 , 16 ] among others. Electrodeposition is a very suitable growth technique for the fabrication of these nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

Scaling Up the Production of Electrodeposited Nanowires: A Roadmap towards Applications

et al. 2021

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The use of metallic nanowires is mostly reduced to scientific areas where a small quantity of nanostructures are needed. In order to broaden the applicability of these nanomaterials, it is necessary to establish novel synthesis protocols that provide a larger amount of nanowires than the conventional laboratory fabrication processes at a more competitive cost. In this work, we propose several modifications to the conventional electrochemical synthesis of nanowires in order to increase the production with considerably reduced production time and cost. To that end, we use a soft anodization procedure of recycled aluminum at room temperature to produce the alumina templates, followed by galvanostatic growth of CoFe nanowires. We studied their morphology, composition and magnetic configuration, and found that their properties are very similar to those obtained by conventional methods.

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High Spin Polarization in Co₂FeSn Heusler Nanowires for Spintronics

Cited by 31 publications

References 52 publications

Self-connected CuO–ZnO radial core–shell heterojunction nanowire arrays grown on interdigitated electrodes for visible-light photodetectors

Self-connected CuO–ZnO radial core–shell heterojunction nanowire arrays grown on interdigitated electrodes for visible-light photodetectors

Heusler‐Based Cylindrical Micro‐ and Nanowires

Scaling Up the Production of Electrodeposited Nanowires: A Roadmap towards Applications

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High Spin Polarization in Co2FeSn Heusler Nanowires for Spintronics

Cited by 31 publications

References 52 publications

Self-connected CuO–ZnO radial core–shell heterojunction nanowire arrays grown on interdigitated electrodes for visible-light photodetectors

Self-connected CuO–ZnO radial core–shell heterojunction nanowire arrays grown on interdigitated electrodes for visible-light photodetectors

Heusler‐Based Cylindrical Micro‐ and Nanowires

Scaling Up the Production of Electrodeposited Nanowires: A Roadmap towards Applications

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High Spin Polarization in Co₂FeSn Heusler Nanowires for Spintronics