Nanowires Made of FeNi and FeCo Alloys: Synthesis, Structure, and Mössbauer Measurements

Долуденко, И. М.; Загорский, Д. Л.; Фролов, К. В.; Перунов, И. В.; Чуев, М. А.; Каневский, В. М.; Erokhina, N. S.; Bedin, S. A.

doi:10.1134/s1063783420090061

Cited by 19 publications

(8 citation statements)

References 21 publications

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“…Figure 5 a), the dominant part of each spectrum (component I), of total relative intensity 74–76%, is composed of three or two Zeeman sextets with isomer shift close to zero and HMF values between 32–38 T. This component is attributed to the crystalline Fe-Co phase forming cores of nanochains and possibly containing a trace amount of residues from the manufacturing procedure. The HMF values derived for the sextets decrease with increasing cobalt content, which is in line with the observations reported for bulk [ 37 ] and nano-sized [ 38 ] iron-cobalt alloys as well as the iron-cobalt nanowires [ 39 ]. Spectrum obtained for the sample Fe 0.75 Co 0.25 H 2 also comprises a small (6%) component IV in a form of a set of more smeared sextets corresponding to the HMF values of about 16, 24, and 28 T. They might be attributed to (Fe-Co) 3 C or other Fe-Co-B-C structures [ 40 , 41 ].…”

Section: Resultssupporting

confidence: 90%

Evolution of Structural and Magnetic Properties of Fe-Co Wire-like Nanochains Caused by Annealing Atmosphere

et al. 2021

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Thermal treatment is a post-synthesis treatment that aims to improve the crystallinity and interrelated physical properties of as-prepared materials. This process may also cause some unwanted changes in materials like their oxidation or contamination. In this work, we present the post-synthesis annealing treatments of the amorphous Fe1−xCox (x = 0.25; 0.50; 0.75) Wire-like nanochains performed at 400 °C in two different atmospheres, i.e., a mixture of 80% nitrogen and 20% hydrogen and argon. These processes caused significantly different changes of structural and magnetic properties of the initially-formed Fe-Co nanostructures. All of them crystallized and their cores were composed of body-centered cubic Fe-Co phase, whereas their oxide shells comprised of a mixture of CoFe2O4 and Fe3O4 phases. However, the annealing carried out in hydrogen-containing atmosphere caused a decomposition of the initial oxide shell layer, whereas a similar process in argon led to its slight thickening. Moreover, it was found that the cores of thermally-treated Fe0.25Co0.75 nanochains contained the hexagonal closest packed (hcp) Co phase and were covered by the nanosheet-like shell layer in the case of annealing performed in argon. Considering the evolution of magnetic properties induced by structural changes, it was observed that the coercivities of annealed Fe-Co nanochains increased in comparison with their non-annealed counterparts. The saturation magnetization (MS) of the Fe0.25Co0.75 nanomaterial annealed in both atmospheres was higher than that for the non-annealed sample. In turn, the MS of the Fe0.75Co0.25 and Fe0.50Co0.50 nanochains annealed in argon were lower than those recorded for non-annealed samples due to their partial oxidation during thermal processing.

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Section: Resultssupporting

confidence: 90%

Evolution of Structural and Magnetic Properties of Fe-Co Wire-like Nanochains Caused by Annealing Atmosphere

et al. 2021

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“…The presence of other peaks indicated a polycrystalline structure. [61,66,67] In the case of equiatomic compositions, both fcc and bcc phases are mixed and for Fe-rich composition bcc phase is dominant with a preferred direction of [110]. For fcc phase (about 80% of Ni), the lattice parameter is 3.569 Å [68] and for bcc phase it amounts 2.861 Å (80% of Fe).…”

Section: Structural Properties Of Feni Nws and Ntsmentioning

confidence: 99%

1D Nanomaterials in Fe‐Group Metals Obtained by Synthesis in the Pores of Polymer Templates: Correlation of Structure, Magnetic, and Transport Properties

Panina

Zagorskiy

Shymskaya

et al. 2021

Physica Status Solidi (a)

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1D cylindrical magnetic nanostructures (FeNi, FeCo, FeCoP) of complex topology such as nanowires (NWs), nanotubes (NTs), multilayered nanowires, and core–shell structures are discussed from the perspective of engineering a wide variety of magnetic materials from hard to semihard to soft. Most of recent data are given for the materials synthesized in the pores of polymer ion‐track membranes, which makes it possible to tune systematically the geometrical parameters, morphology, and composition. The key properties including crystal and micromagnetic structure, magnetic anisotropy, and coercivity are analyzed. Co‐based NWs with uniform morphology demonstrate coercivity of more than 10 kOe due to the combination of crystalline and shape anisotropies. In the case of NTs, the demagnetizing effect is reduced owing to a helical arrangement of the magnetization, which leads to low values of coercivity and remanence magnetization. Varying the geometrical parameters of multilayered NWs, the alternating soft and semihard magnetic layers can be made within a single nanowire, which is important for spin‐valve magnetoresistance. Au‐coated ferromagnetic nanostructures are biocompatible and can be used to enhance optical absorption. Ni@Au NTs used as substrates for Raman spectroscopy demonstrate the enhancement factor of the order of 104. Some aspects related to applications of 1D magnets are briefly overviewed.

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“…Therefore, among all of the compositions, alloys containing iron might be more favorable as they have high saturation magnetization, leading to a wider achievable range of saturation magnetizations. Note that the alloyed MNWs were also made of both magnetic components, such as iron–nickel [ 60 , 61 ], iron–cobalt [ 62 , 63 ], nickel–cobalt [ 64 , 65 ], or iron–cobalt–nickel [ 66 ]. When both components are magnetic, the saturation magnetization range will be limited to the minimum and maximum saturation magnetization of the components, except iron–cobalt MNWs with a 2:1 atomic ratio that leads to higher saturation magnetization [ 63 , 67 , 68 ], as shown in Figure 3 f. Generally speaking, having both magnetic components does not provide much flexibility to tailor the saturation magnetization as the encoding parameters.…”

Section: Why Magnetic Nanowires For Nanobarcodes?mentioning

confidence: 99%

“…This is also valid when the MNWs are made of three components, such as iron, nickel, and cobalt, as trinary [ 69 , 70 , 71 ]. However, these cases are very useful to tailor other magnetic properties, such as coercivity, where, as an example, Permalloy (iron–nickel with a 1:4 atomic ratio) is one of the most popular compositions [ 61 , 67 , 72 , 73 ].…”

Section: Why Magnetic Nanowires For Nanobarcodes?mentioning

confidence: 99%

Magnetic Nanowires for Nanobarcoding and Beyond

Kouhpanji

Stadler

2021

Sensors

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Multifunctional magnetic nanowires (MNWs) have been studied intensively over the last decades, in diverse applications. Numerous MNW-based systems have been introduced, initially for fundamental studies and later for sensing applications such as biolabeling and nanobarcoding. Remote sensing of MNWs for authentication and/or anti-counterfeiting is not only limited to engineering their properties, but also requires reliable sensing and decoding platforms. We review the latest progress in designing MNWs that have been, and are being, introduced as nanobarcodes, along with the pros and cons of the proposed sensing and decoding methods. Based on our review, we determine fundamental challenges and suggest future directions for research that will unleash the full potential of MNWs for nanobarcoding applications.

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Nanowires Made of FeNi and FeCo Alloys: Synthesis, Structure, and Mössbauer Measurements

Cited by 19 publications

References 21 publications

Evolution of Structural and Magnetic Properties of Fe-Co Wire-like Nanochains Caused by Annealing Atmosphere

Evolution of Structural and Magnetic Properties of Fe-Co Wire-like Nanochains Caused by Annealing Atmosphere

1D Nanomaterials in Fe‐Group Metals Obtained by Synthesis in the Pores of Polymer Templates: Correlation of Structure, Magnetic, and Transport Properties

Magnetic Nanowires for Nanobarcoding and Beyond

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