Origin of the Initial Permeabiliy of Ni0.8-xZn0.2CoxFe2O4+δ Ferrite

Ni0.8-xZn0.2CoxFe2O4+δ조성 페라이트의 투자율 변화 기구

  • 안용운 (경남대학교 재료공학과) ;
  • 김종령 (경남대학교 재료공학과) ;
  • 오영우 (경남대학교 재료공학과)
  • Published : 2004.01.01


The cause for the variation of the initial permeability according to the Co substitution of Ni-Zn ferrite used in the LC resonance filter for the power line communication is studied. The initial permeability decreases as the quantity of Co diminishes, and the saturation magnetization increases as the quantity increases. Because the sintering density and the microstructure of ferrite show little change, the variation of the initial permeability can't be explained by the density, microstructure nor the saturation magnetization factor. The magnetocrystalline anisotropy increases, similar with the saturation magnetization, as the quantity of Co increases. The increase of magnetocrystalline anisotropy value makes the domain wall energy grow, which leads to the decrease of the initial permeability, because there's linear law between the magnetocrystalline anisotropy and the domain wall energy. The resonance frequency to Co substitution moved to high frequency band, due to the close relationship with domain wall energy, Initial permeability decreaed a little with an increase of Co contents, but resonace frequency moved to high frequency band. as a result of that, when Co was added 0.05 mol, initial permeability and resonace frequency was 75 and 25 MHz respectively.


  1. 전기전자재료학회논문지 v.15 no.5 첨가제 변화에 따른 $Ni_{0.8}Zn_{0.2}Fe_2O_4$의 미세구조와 자기적 특성 오영우;이선학;이해연;김현식
  2. 전기전자재료학회논문지 v.16 no.6 Blocking filter용 자심 재료의 전자기 특성 및 신호 감쇄율 오영우;이해연;김현식
  3. 전기전자재료학회 2003년 춘계학술대회 논문집 Ni-Zn 페라이트 물성의 Co₃O₄ 치환효과 안용운;김종령;오영우;김현식;이해연
  4. Introduction to magnetic materials Cullity
  5. Handbook of Magnetic Materials v.8 Brabers
  6. IEEE Trans Magn. v.Mag-2 no.3 Separation of Susceptibility Mechanisms for Ferrites of Low Anisotropy A.Globus;P.Duplex
  7. J. Mater. Sci. v.11 Effect of intergranular porosity of initial permeability and coercive force in manganese zinc ferrite G.C.Jain;B.K.Das;R.S.Khanduja;S.C.Gupta
  8. J. de Phys. v.38 no.C1-1 Some physical considerations about the domain wall wize theory of magnetization mechanisms A.Globus
  9. IEEE Trans. Mag. v.Mag-7 Determination of initial permeability curve form crystallites size and effective anisotropy field A.Globus;P.Duples;M.Guyot
  10. 한국자기학회지 v.5 no.3 NiCuZn ferrite의 특성에 미치는 조성의 영향 남중희;정현학;신재영;오재희
  11. J. Am. Ceram. Soc. v.60 no.1-2 Effects of porosity and grain size on the magnetic properties of Ni-Zn ferrite H.Igarashi
  12. 자성재료세라믹스 윤상옥;이현직;윤기현;정형진