K. Tan

Tohoku University, Sendai, Kagoshima-ken, Japan

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Publications (6)2.84 Total impact

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    ABSTRACT: A giant magnetoimpedance (GMI) probe was fabricated in order to detect high-frequency magnetic fields. Magnetic near field measurements were carried out using the probe. A microstrip line driven by a current whose frequency was changed from 500 Hz to 1 GHz was used as a signal source in the measurements. The probe could clearly detect the characteristics of the field distribution such as high magnetic field strengths near both longitudinal edges of the signal plane of the microstrip line and null points. At a signal frequency of 100 MHz, the experimental result was compared with numerical calculation data. The output profile of the measurement agreed well with the profile of the calculated field distribution. The detection of the characteristics and the agreement indicate the potential that the GMI probe has high spatial resolution in a wide frequency range
    IEEE Transactions on Magnetics 11/2006; · 1.42 Impact Factor
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    ABSTRACT: Closed magnetic circuit type ferromagnetic RF integrated inductors have been fabricated based on MEMS-like micro fabrication techniques. The taper etching process greatly helped to endure sufficient magnetic flux flow at the edge of the top and bottom magnetic layers. Air cores and three different sandwich type ferromagnetic inductors are also microfabricated. Measured results exhibited the quality factor Q=12, being highest among the published data of ferromagnetic RF integrated inductor at 1 GHz.
    Microwave Symposium Digest, 2005 IEEE MTT-S International; 07/2005
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    ABSTRACT: This paper studies the microfabrication process and the experimental demonstration of a closed magnetic circuit type GHz-drive integrated spiral inductors, consisting of a stack of 0.2-μm-thick RF-sputter deposited CoNbZr, RF-sputter deposited SiO<sub>3</sub>, 3-μm-thick electrodeposited Cu coil, SiO<sub>3</sub> with surface planarization, and 0.2-μm-thick RF-sputter deposited CoNbZr. Main idea is to establish the fabrication process of such a sophisticated microstructure and to demonstrate as high quality factor as possible for the possible practical near-future applications. The structure of the closed magnetic circuit type inductor discussed in this paper.
    Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International; 05/2005
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    ABSTRACT: The detection of high frequency field up to 1 GHz by the use of a new sensor element, used for highly sensitive giant magneto-impedance sensors, was discussed. This element, prepared in a magnetic multilayer like structure functions to decrease the optimum bias field. The Ta[/NiFe/Cu]66/NiFe/Ta multilayer was deposited by RF sputtering with a total thickness of 1010 nm. Results show that the bias field was only one tenth of the theoretical resonance field of conventional high frequency carrier type sensors, a value that is sufficiently low for practical use.
    01/2005;
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    ABSTRACT: Magnetic strips aimed at high-frequency carrier-type magnetic field sensors were studied by using various strip widths in a carrier frequency range of gigahertz to obtain conditions for large impedance change. The impedance change was attributed to a magnetic resonance effect. It was shown that DC magnetic field regions at which the maximum change of impedance occur for wide strip elements were closely related to the applied carrier frequencies as expected theoretically. The DC magnetic field for the maximum sensitivity decreased as strips become narrow
    IEEE Transactions on Magnetics 08/2001; · 1.42 Impact Factor
  • Journal of the Magnetics Society of Japan 01/2001; 25(10):1541-1546.