TY - JOUR
T1 - Permeability measurement up to 30 ghz of a magnetically isotropic thin film using a short-circuited coaxial line
AU - Takeda, S.
AU - Kijima-Aoki, H.
AU - Masumoto, H.
AU - Suzuki, H.
N1 - Funding Information:
Acknowledgements This work has been funded by the Japan Society for the Promotion of Science (JSPS) KAKENHI under Grand-in-aid No. 17H03385 and 18H05936. We are grateful to rD . Miyazaki of Tohoku University for his kind support to TEM observation. We thank Prof. M. Yamaguchi of Tohoku University, and D r. M. Naoe of Research Institute for Electro-magnetic materials, for their useful discussions and supportive advices. We wish to thank Mr. T. Hotchi, Mr. S. Motomura, Mr. S. Yamasaki, and Dr. M. Taguchi of KEYCOM corp. for his kind assistant and useful experimental suggestions. The authors would like to thank Enago for the English language review.
Publisher Copyright:
© 2019, Magnetics Society of Japan. All rights reserved.
PY - 2019
Y1 - 2019
N2 - In this study, the high frequency permeability (µ) and ferromagnetic resonance(FMR) phenomena of a thin film with a strong perpendicular magnetic anisotropy and in-plane magnetically isotropic properties was measured using the short-circuited coaxial line technique; the analyzed sample had a toroidal shape. A field method was used for the background correction, where a strong magnetic bias field was applied and removed. However, when using a short-circuited coaxial line, the µ =1 condition cannot be achieved beyond a few ten GHz frequencies, whereas ferromagnetic resonance (denoted as FMR2) occurred because of the insufficient bias field. This resonance was compensated using the Landau-Lifshitz-Gilbert (LLG) equation, and the net µ-f properties without the bias field (denoted as FMR1) up to 30 GHz successfully extracted. Finally, a good agreement between the experimental results and the calculations based on the assumption of a magnetic multi-domain structure in FMR1 was achieved.
AB - In this study, the high frequency permeability (µ) and ferromagnetic resonance(FMR) phenomena of a thin film with a strong perpendicular magnetic anisotropy and in-plane magnetically isotropic properties was measured using the short-circuited coaxial line technique; the analyzed sample had a toroidal shape. A field method was used for the background correction, where a strong magnetic bias field was applied and removed. However, when using a short-circuited coaxial line, the µ =1 condition cannot be achieved beyond a few ten GHz frequencies, whereas ferromagnetic resonance (denoted as FMR2) occurred because of the insufficient bias field. This resonance was compensated using the Landau-Lifshitz-Gilbert (LLG) equation, and the net µ-f properties without the bias field (denoted as FMR1) up to 30 GHz successfully extracted. Finally, a good agreement between the experimental results and the calculations based on the assumption of a magnetic multi-domain structure in FMR1 was achieved.
KW - FMR
KW - Ferromagnetic resonance
KW - GHz band
KW - LLG
KW - Magnetic thin film
KW - Permeability measurement
KW - Perpendicular anisotropy
KW - Short-circuited coaxial line
KW - Wideband measurement
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U2 - 10.3379/msjmag.1909R001
DO - 10.3379/msjmag.1909R001
M3 - Article
AN - SCOPUS:85073349765
VL - 43
SP - 91
EP - 98
JO - Journal of the Magnetics Society of Japan
JF - Journal of the Magnetics Society of Japan
SN - 1882-2932
IS - 5
ER -