Enhancing magnetoimpedance response by anisotropic surface-charge accumulation

Zare, Mohammad; Jamilpanah, Loghman; Sadeghi, Ali; Ghanaatshoar, Majid; Mohseni, Majid

doi:10.1016/j.jmmm.2024.171838

Cited by 1 publication

(2 citation statements)

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“…Therefore, it can be understood that the dipole interaction depends on r. As shown in Figure 7a, the peak field (H p ) of the composite ribbons decreased with increasing thickness of the carbon layer. The H p can be expressed as [28] H p =H p(Co) + H dip + H stress (5) where H p represents the peak field of the composite ribbon strips, H p(Co) refers to the peak field of the Co-based ribbon, and H stress is the stress energy of the coating layer. The H dip changes as a function of carbon layer thickness, as shown in Figure 7b.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, they are not sensitive to mechanical stress and can work in harsh environments for a long time, so the stability and reliability of product devices are greatly improved, especially for military products sensing applications [2]. At present, the research on enhanced MI properties of Co-based amorphous ribbon mainly focuses on annealing process, optimizing structural parameters, and controlling the surface [3][4][5]. However, higher temperature annealing treatment (>350 • C) on the ribbons will lead to a certain degree of brittleness, which greatly limits its application.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Magnetoimpedance Effect in Co-Based Micron Composite CoFeNiSiB Ribbon Strips Coated by Carbon and FeCoGa Nanofilms for Sensing Applications

Yang,

Liu,

Chen

et al. 2024

Sensors

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Quenched Co-based ribbon strips are widely used in the fields of magnetic amplifier, magnetic head material, magnetic shield, electric reactor, inductance core, sensor core, anti-theft system label, and so on. In this study, Co-based composite CoFeNiSiB ribbon strips with a micron width were fabricated by micro-electro-mechanical systems (MEMS) technology. The carbon and FeCoGa nanofilms were deposited for surface modification. The effect of carbon and FeCoGa nanofilm coatings on the crystal structure, surface morphology, magnetic properties, and magnetoimpedance (MI) effect of composite ribbon strips were systematically investigated. The results show that the surface roughness and coercivity of the composite ribbon strips are minimum at a thickness of the carbon coating of 60 nm. The maximum value of MI effect is 41% at 2 MHz, which is approximately 2.4 times greater than plain ribbon and 1.6 times greater than FeCoGa-coated composite ribbon strip. The addition of a carbon layer provides a conductive path for high frequency currents, which effectively reduces the characteristic frequency of the composite ribbon strip. The FeCoGa coating is able to close the flux path and reduce the coercivity, which, in turn, increases the transverse permeability and improves the MI effect. The findings indicate that a successful combination of carbon layer and magnetostrictive FeCoGa nanofilm layer can improve the MI effect and magnetic field sensitivity of the ribbon strips, demonstrating the potential of the composite strips for local and micro area field sensing applications.

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Section: Resultsmentioning

confidence: 99%