Magneto-Impedance of Micromachined Thin Films Less Than 100 $\mu$m in Length

Kikuchi, Hiroaki; Shima, Takuya; Uetake, Hiroaki; Yabukami, S.

doi:10.1109/lmag.2016.2614795

Cited by 9 publications

(3 citation statements)

References 32 publications

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“…This optimization is especially significant for biological applications of the MI sensor. Narrower strips (thin film or ribbon) for MI elements are beneficial to reduce the demagnetizing effect and improve the MI effect [37]. The demagnetizing field in the direction of the width hinders the control of the anisotropy of the elements [38].…”

Section: Resultsmentioning

confidence: 99%

“…These results can provide a new direction and theoretical foundation for improving the MI effect in the soft magnetic composite ribbon strips used in the local and micro area field of sensing applications. Narrower strips (thin film or ribbon) for MI elements are beneficial to reduce the demagnetizing effect and improve the MI effect [37]. The demagnetizing field in the direction of the width hinders the control of the anisotropy of the elements [38].…”

Section: Discussionmentioning

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%

Section: Discussionmentioning

confidence: 99%

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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“…There are different reasons contributing to the delay of the competitive integration of high frequency nanostructured thin film elements into global market. One of them is the need of additional understanding of basic concepts of microwave radiation absorption by nanostructured multilayered elements and elaboration of simple, fast and cheap characterization of materials with high dynamic permeability [18].…”

Section: Introductionmentioning

confidence: 99%

Angular Dependence of the Ferromagnetic Resonance Parameters of [Ti/FeNi]6/Ti/Cu/Ti/[FeNi/Ti]6 Nanostructured Multilayered Elements in the Wide Frequency Range

et al. 2020

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Magnetically soft [Ti(6)/FeNi(50)]6/Ti(6)/Cu(500)/Ti(6)/[FeNi(50)/Ti(6)]6 nanostructured multilayered elements were deposited by rf-sputtering technique in the shape of elongated stripes. The easy magnetization axis was oriented along the short size of the stripe using deposition in the external magnetic field. Such configuration is important for the development of small magnetic field sensors employing giant magnetoimpedance effect (GMI) for different applications. Microwave absorption of electromagnetic radiation was experimentally and theoretically studied in order to provide an as complete as possible high frequency characterization. The conductor-backed coplanar line was used for microwave properties investigation. The medialization for the precession of the magnetization vector in the uniformly magnetized GMI element was done on the basis of the Landau–Lifshitz equation with a dissipative Bloch–Bloembergen term. We applied the method of the complex amplitude for the analysis of the rotation of the ferromagnetic GMI element in the external magnetic field. The calculated and experimental dependences for the amplitudes of the imaginary part of the magnetic susceptibility tensor x-component and magnetoabsorption related to different angles show a good agreement.

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