TY - JOUR
T1 - Impact of Complex Permeability Measurements up to Millimeter-Wave Frequency Range
AU - Yabukami, S.
AU - Nozawa, K.
AU - Tonthat, L.
AU - Okita, K.
AU - Sai, R.
N1 - Funding Information:
ACKNOWLEDGMENT The authors thank Prof. Munakata, Sojo University, for providing the CoFeB film and Mr. Moriizumi, Candox Systems, for fabricating the probe. This work was supported in part by the Business Incubation Program (BIP) of Tohoku University and in part by the Ministry of Internal Affairs and Communications through Research and Development to Expand Radio Frequency Resources under Grant JPJ000254.
Publisher Copyright:
© 1965-2012 IEEE.
PY - 2021/2
Y1 - 2021/2
N2 - 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.
AB - 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.
KW - Complex permeability measurement
KW - magnetic thin film
KW - microstrip-line-type probe
KW - millimeter-wave
KW - sample size limitation
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U2 - 10.1109/TMAG.2020.3011971
DO - 10.1109/TMAG.2020.3011971
M3 - Article
AN - SCOPUS:85098763156
SN - 0018-9464
VL - 57
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 2
M1 - 9149663
ER -