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자료유형
학술저널
저자정보
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.10 No.3
발행연도
2005.9
수록면
122 - 127 (6page)

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New classes of LC resonators for micro magnetic sensor device were proposed and fabricated. The first type LC resonator (Type Ⅰ) consists of a small piece of microwire and two cylindrical electrodes at the end of the microwire without direct contact to its ferromagnetic core. In type Ⅰ resonator the ferromagnetic core of the microwire and cylindrical electrodes act as an inductor and two capacitors respectively to form a LC circuit. The second type LC resonator (Type Ⅱ) consists of a solenoidal micro-inductor with a bundle of soft magnetic microwires as a core. The solenoidal micro-inductors fabricated by MEMS technique were 500~1,000 ㎛ in length with 10~20 turns. A capacitor is connected in parallel to the micro-inductor to form a LC circuit. A tiny glass coated Co_(83.2)B_(3.3)Si_(5.9)Mn_(7.6) microwire was fabricated by a glass-coated melt spinning technique. A supergiant magneto-impedance effect was found in a type Ⅰ resonator as much as 400,000% by precise tuning frequency at around 518.51 ㎒. In type Ⅱ resonator the changes of inductance as a function of external magnetic field in micro-inductors with properly annealed microwire cores were varied as much as 370%. The phase angle between current and voltage was also strongly dependent on the magnetic field. The drastic increments of magnetoimpedance at near the resonance frequency were observed in both types of LC resonators. Accordingly, the sudden change of the phase angle, as large as 180℃, evidenced the occurrence of the resonance at a given external magnetic field.

목차

Abstract

1. Introduction

2. Experiment

3. Results and Discussion

4. Conclusions

Acknowledgements

References

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