Effect of Current Annealing on Domain Structure in Amorphous and Nanocrystalline FeCoMoB Microwires

Klein, Peter; Varga, R.; Onufer, J.; Ziman, J.; Badini-Confalonieri, G. A.; Vázquez, M.

doi:10.12693/aphyspola.131.681

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…8 a). The same type of wires in a parallel manner constitute an increase of the total cross-sectional area of the wires, resulting in a diminution of the effective resistivity and hence a stronger skin effect [33]. Such "effective" area is decreased when varying the order of the wires in the arrangement, three wires of the same type are reduced to two (AXXAAX, Fig.…”

Section: Transmission Spectra Of Composites Incorporating As-cast And...mentioning

confidence: 99%

Microwave programmable response of Co-based microwire polymer composites through wire microstructure and arrangement optimization

Uddin

Qin

Estévez

et al. 2019

Composites Part B: Engineering

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Traditional approaches to realize microwave tunability in microwire polymer composites which mainly rely on topological factors, magnetic field/stress stimuli, and hybridization are burdensome and restricted to rather narrow band frequencies. This work presents a facile strategy based on a single component tunable medium to program the transmission response over wide frequency bands. Structural modification of one type of microwire through suitable current annealing and arrangement of the annealed wires in multiple combinations were sufficient to distinctly red-shift the transmission dip frequency of the composites. Such one wire control-strategy endorsed a programmable multivariable system grounded on the variations in both the overall array conductivity or "effective" area determined by the wires arrangement and the relaxation time dictated by the annealing degree of microwires. These results can be used to prescribe transmission frequency bands of desired features via diverse microwire arrays and microwave performance from a single component to composite system design. phenomena/microwave absorption) have been shown in composites containing such wires, their electromagnetic response is limited to topological factors and magnetic field/stress stimuli [3][4][5][6][7]. Most recently, inspired by the enhancement in the mechanical and electromagnetic properties of hybrid composites by the addition of nano-carbons [8-11] we adopted the multiscale design philosophy by adding carbon fillers into the microwire composites [12,13]. However, such an approach required delicate control and fine-tuning of the constitutive parameters of the nano-carbons.Considering that the wires' intrinsic electromagnetic parameters relate to their microstructure, we propose to add to these methods a programming-based strategy by incorporating arrays of the same type of microwire but with different internal structure and adjusting their combination within the composite. Apart from doping with metallic elements such as Cu, Cr, Nb, the microstructure of the microwires and their electromagnetic properties can be conveniently tailored by current annealing, which promotes internal stress relaxation or redistribution and alteration in domain structure.Thus, the approach presented here is to implement different DC current-annealing

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Section: Transmission Spectra Of Composites Incorporating As-cast And...mentioning

confidence: 99%

Microwave programmable response of Co-based microwire polymer composites through wire microstructure and arrangement optimization

Uddin

Qin

Estévez

et al. 2019

Composites Part B: Engineering

View full text Add to dashboard Cite

show abstract

“…The changes in DC resistance of the current-annealed microwires were monitored with a digital multi-meter showing a considerable drop for the 40 mA treated-wire which is related to the onset of crystallization and larger grain size due to the rise in temperature [9,22]. The microstructure of the as-cast and current-annealed wires consists mainly of nanocrystalline droplets embedded in amorphous matrix [23]. Magnetic properties of the microwires were evaluated by Quantum Design PPMS-VSM at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Vertical interface augmented tunability of scattering spectra in ferromagnetic microwire/silicone rubber metacomposites

et al. 2021

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Previously, we have demonstrated a viable approach based on microstructural and topological modulation of periodically arranged elements to program wave scattering in ferromagnetic glass-coated microwire metacomposites. In order to fully exploit the intrinsic structure of the composite, here, we implement the concept of composites plainification by an in-built vertical interface on randomly dispersed short-cut microwires allowing the adjustment of electromagnetic properties to a larger extent. Such interface was modified through arranging wires with different internal structures in two separated regions and by alternating these regions through wire concentration variations associated with polarization differences across the interface. When the wire concentration was equal in both regions, two well-defined transmission windows with varied amplitude and bandwidth were generated. Wire concentration fluctuations resulted in strong scattering changes ranging from broad passbands to pronounced stopbands, demonstrating the intimate relationship between wire content and space charge variations at the interface. This provides a new method to rationally exploit interfacial effects and microstructural features of microwire metacomposites. Moreover, the advantages of enabling tunable scattering spectra by merely 0.053 vol.% of fillers and simple structure make the proposed plainification strategy instrumental to designing filters with broadband frequency selectivity.

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“…Recently, a smart strategy of incorporating such microwires into polymer matrix has been devised to enable additional electromagnetic functionalities and at the same time preserving the mechanical performance of the resultant composites [5,6]. Approaches to improve the electromagnetic tunability of such composites have been limited to considering influential roles such as wire volume fraction [7], wire length [8], topological factors [9] and magnetic field/stress stimuli [10][11][12]. Most recently, the multiscale design philosophy was also adopted by adding nano-carbon fillers into the microwire composites [13,14], however, such a method requires delicate and fine-tuning of the nano-carbon coatings.…”

Section: Introductionmentioning

confidence: 99%

Programmable microwire composites: from functional units to material design

Uddin

Estévez

Qin

et al. 2020

J. Phys. D: Appl. Phys.

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Microwire composites possess a wide range of functionalities that can be actively manipulated by magnetic field/stress stimuli or hybridization. Beyond those strategies, here we focus on programming microwave response by designing the wire functional units and assembling them in a specific arrangement. The programming was based on a code type defined by structural relaxation and electromagnetic damping and on a code pattern by wave attenuation, effective conductivity and near-field interaction effects. Structural relaxation was achieved by current annealing the wires, which was reflected in changes in Curie temperature, structural, magnetic and electrical properties. The wave propagation mapped by the transmission coefficient was manipulated by the wire concentration and periodicity and by arrangement of as-cast and annealed wires in their array. Increasing the wire concentration blueshifted the transmission band of the wire composites due to larger conductivity, while decreasing the wire periodicity redshifted the band owing to stronger inter-wire coupling. A larger blueshift was obtained by alternating as-cast and annealed wires due to an overlapped flow closure of fields from the same type of wire in the array. Our strategy demonstrates that macroscopic properties of wire composites can be effectively programmed from a material structure/unit arrangement perspective. This concept promotes deeper understanding of high-frequency properties and further expands the applications of fiber-reinforced composites in fields such as information, energy and security technologies.

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Effect of Current Annealing on Domain Structure in Amorphous and Nanocrystalline FeCoMoB Microwires

Cited by 6 publications

References 15 publications

Microwave programmable response of Co-based microwire polymer composites through wire microstructure and arrangement optimization

Microwave programmable response of Co-based microwire polymer composites through wire microstructure and arrangement optimization

Vertical interface augmented tunability of scattering spectra in ferromagnetic microwire/silicone rubber metacomposites

Programmable microwire composites: from functional units to material design

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