NFC의 자기차폐용 Ni-Zn-Cu 페라이트의 자기특성에 미치는 소결온도의 영향

서지정보

ㆍ발행기관 : 한국분말야금학회 ㆍ수록지정보 : 한국분말야금학회지 / 23권 / 2호
ㆍ저자명 : 류요한, 김성수

목차

1. 서 론
2. 실험방법
3. 결과 및 고찰
4. 결 론
감사의 글
References

영어 초록

This study investigates the influence of sintering temperature on the magnetic properties and frequency dispersion of the complex permeability of Ni–Zn–Cu ferrites used for magnetic shielding in near-field communication (NFC) systems. Sintered specimens of (Ni0.7Zn0.3)0.96Cu0.04Fe2O4 are prepared by conventional ceramic processing. The complex permeability is measured by an RF impedance analyzer in the range of 1 MHz to 1.8 GHz. The real and imaginary parts of the complex permeability depend sensitively on the sintering temperature, which is closely related to the microstructure, including grain size and pore distribution. In particular, internal pores within grains produced by rapid grain growth decrease the permeability and increase the magnetic loss at the operating frequency of NFC (13.56 MHz). At the optimized sintering temperature (1225-1250°C), the highest permeability and lowest magnetic loss can be obtained.

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