NFC의 자기 차폐용 Ni-Zn-Co 페라이트 자성체의 고주파 자기특성
High-frequency Magnetic Properties of Ni-Zn-Co Ferrites Used for Mangetic Shielding in NFC
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This study investigated the magnetic properties and frequency dispersion of complex permeability of Ni-Zn-Co ferritesused for magnetic shielding in near field communication (NFC) system. The sintered specimens of (Ni0.7Zn0.3)1-xCoxFe2O4 compositionwere prepared by the conventional ceramic processing. The coercive force and saturation magnetization were measuredby vibrating sample magnetometer. The complex permeability was measured by RF impedance analyzer in therange of 1 MHz~1.8 GHz. The coercive force increased and saturation magnetization decreased with increasing the Cosubstitution. The real and imaginary parts of complex permeability decreased and the resonance frequency increasedwith Co substitution, which was attributed to the increase in crystal anisotropy field and reduction in saturation magnetization. The effect of Co substitution could be found in reducing the magnetic loss to nearly zero at the operatingfrequency of NFC (13.56 MHz).
Abstract
This study investigated the magnetic properties and frequency dispersion of complex permeability of Ni-Zn-Co ferritesused for magnetic shielding in near field communication (NFC) system. The sintered specimens of (Ni0.7Zn0.3)1-xCoxFe2O4 compositionwere prepared by the conventional ceramic processing. The coercive force and saturation magnetization were measuredby vibrating sample magnetometer. The complex permeability was measured by RF impedance analyzer in therange of 1 MHz~1.8 GHz. The coercive force increased and saturation magnetization decreased with increasing the Cosubstitution. The real and imaginary parts of complex permeability decreased and the resonance frequency increasedwith Co substitution, which was attributed to the increase in crystal anisotropy field and reduction in saturation magnetization. The effect of Co substitution could be found in reducing the magnetic loss to nearly zero at the operatingfrequency of NFC (13.56 MHz).
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