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Impact of Complex Permeability Measurements up to Millimeter-Wave Frequency Range

Yabukami, S and Nozawa, K and Tonthat, L and Okita, K and Sai, R (2021) Impact of Complex Permeability Measurements up to Millimeter-Wave Frequency Range. In: IEEE Transactions on Magnetics, 57 (2).

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Official URL: https://doi.org/10.1109/TMAG.2020.3011971


A highly sensitive microstrip-line-type probe using a flexible substrate was developed to measure thin-film permeability continuously up to the millimeter-wave frequency range (over 30 GHz). The probe enables broad bandwidth and highly sensitive permeability measurements without sample size limitations. The complex permeability of the CoFeB film (45 mm ×25 mm and 0.5μm in thickness), CoNbZr film (25 mm ×25 mm and 3 nm in thickness), and nickel ferrite film (8 mm ×5 mm, and 1.2μm in thickness) were optimized. The measured permeability spectrum and ferromagnetic resonance frequency showed good agreement with the theoretical values based on the Landau-Lifshitz-Gilbert equation and eddy current generation up to 67 GHz.

Item Type: Journal Article
Publication: IEEE Transactions on Magnetics
Publisher: Institute of Electrical and Electronics Engineers Inc.
Additional Information: The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords: Cobalt compounds; Iron compounds; Millimeter waves; Niobium alloys; Probes; Ternary alloys; Thin films; Zircaloy, Broad bandwidths; Complex permeability; Ferromagnetic resonance frequency; Flexible substrate; Millimeter wave frequencies; Permeability measurements; Permeability spectrum; Theoretical values, Boron compounds
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 16 Feb 2023 10:24
Last Modified: 16 Feb 2023 10:24
URI: https://eprints.iisc.ac.in/id/eprint/80526

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