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NiCuZn ferrite의 특성에 미치는 조성의 영향
남중희(J. H. Nam),정현학(H. H. Jung),신재영(J. Y. Shin),오재희(J. H. Oh) 한국자기학회 1995 한국자기학회지 Vol.5 No.3
NiCuZn ferrites were prepared by a solid-state reaction and sintered at 900℃ for 5 hours. Its properties were investigated by controlling the ferrite composition and processing. NiCuZn ferrite with a composition of (Ni_(0.2)Cu_(0.2)Zn_(0.6)O)_(1.02)(Fe₂O₃)_(0.98) was found to have the maximum initial permeability as a result of the variation of Cu content and the (Ni+Cu) / Zn ratio. Curie temperature(Tc) of NiCuZn ferrite was decreased with the larger Cu content and increased with the larger Ni content. NiCuZn ferrites of (Ni_(0.2)Cu_(0.2)Zn_(0.6)O)_(1-w)(Fe₂O₃)_(1+w) composition milled for 20~80 hours had the maximum initial permeability at w=-0.015 and Curie temperature(Tc) was decreased with the increasing of Fe₂O₃ deficiency(w).
Ni₂-xZnxY - 고무 복합체의 복소투자율과 전파흡수특성
신재영(J. Y. Shin),오재희(J. H. OH),권형주(H. J. Kwon) 한국자기학회 1995 한국자기학회지 Vol.5 No.1
The microwave absorbing characteristics and complex permeability of Ni_(2-x)Zn_xY-rubber composites with variation of composition and particle size were investigated. With a ferrite particle with a diameter of about 1 ㎛, only spin rotational resonance was observed. This behavior probably due to the particle being sufficiently small to approach single domain characteristics so that only spin rotations can occur. The first matching frequency, found in Ni_(2-x)Zn_xY-rubber composites, which was higher than that of spin rotational resonance, increased with spin rotational resonance frequency. It is also found that the second matching frequency is independent of spin rotational resonance frequency. Based on these findings, it could be concluded that the microwave absorbing characteristics were caused by only one type of resonance, the spin rotational resonance.