Directed crystallization of glass‐coated microwires

Larin, V.; Panina, L.V.; Patroi, E.; Pătroi, Dan Nicolae; Башев, В. Ф.; Kutseva, N. A.

doi:10.1002/pssa.201532579

Cited by 9 publications

(9 citation statements)

References 32 publications

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“…It was shown that cobalt is the main crystalline microphase in all samples. However, in contrast to [2], we found that this cobalt modification is the face-centered (fcc-Co) which was discussed in detail in [3]. Fig.…”

Section: Resultsmentioning

confidence: 52%

“…Previosly [2,3], the crystal structure of microwires was studied by X-ray diffraction methods. It was shown that cobalt is the main crystalline microphase in all samples.…”

Section: Resultsmentioning

confidence: 99%

“…In order to form a nano-and/or microcrystalline structure, the wires were subjected to different annealing treatments as described in [2]. We consider that a directed crystallization may occur in the process of annealing at temperatures slightly lower than the primary crystallization temperature when one end of microwires is overheated (by ~60 , named as "ignition") due to release of latent heat and propagation of the crystallization front.…”

Section: Methodsmentioning

confidence: 99%

“…After annealing treatment at temperatures close to the crystallization temperature, initially amorphous microwires change their structural and magnetic properties. Thus, the coercivity of Co-rich glass-coated microwires was significantly increased as a result of directional crystallization of the amorphous core [2][3].…”

Section: Introductionmentioning

confidence: 99%

“…The transformation from soft to hard magnetic properties was explained by the formation of crystallites of a hexagonal modification of cobalt [2] and their alignment along the wire during the crystallization process. A more detailed XRD analysis performed in [3] revealed the presence of face-centered modification of cobalt after the crystallization procedure, which could have cubic crystalline anisotropy.…”

Section: Introductionmentioning

confidence: 99%

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Structural and magnetic anisotropy of directionally-crystallized ferromagnetic microwires

et al. 2018

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Abstract. Amorphous ferromagnetic microwires have drawn attention primarily due to their excellent soft magnetic properties as the elements of sensors. In this work, semi-hard magnetic microwires of composition Fe 4.3 Co 67.7 Si 11 B 14 Cr 3 were obtained after a process of directional crystallization from amorphous state. The XRD analysis of crushed and whole wires identified the formation of the face-centered Co-modification as the main phase of directionally crystallized core alloy, which explains a large increase in anisotropy and coercivity. The application of a magnetic field during crystallization may orient the easy anisotropy axis of crystallites along the wire. This is confirmed by the investigation of crystallite orientation with respect to the wire axis and X-rays direction in diffractometer. The obtained results revealed that the formation of crystallites in amorphous Co-rich microwires occurs with the predominant orientation of the crystallographic direction [111] along the wire axis and the direction of a magnetic field during the directional crystallization process.

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Section: Resultsmentioning

confidence: 52%

“…Previosly [2,3], the crystal structure of microwires was studied by X-ray diffraction methods. It was shown that cobalt is the main crystalline microphase in all samples.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural and magnetic anisotropy of directionally-crystallized ferromagnetic microwires

et al. 2018

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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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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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Directed crystallization of glass‐coated microwires

Cited by 9 publications

References 32 publications

Structural and magnetic anisotropy of directionally-crystallized ferromagnetic microwires

Structural and magnetic anisotropy of directionally-crystallized ferromagnetic microwires

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

Heusler‐Based Cylindrical Micro‐ and Nanowires

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