Origin of the Initial Permeability of Manganese-Zinc Ferrite Polycrytals

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J. Korean Ceram. Soc. > Volume 34(4); 1997 > Article

Journal of the Korean Ceramic Society 1997;34(4): 351.

Mn-Zn 페라이트 다결정의 조성에 따른 투자율의 변화 기구

변순천, 제해준¹, 고경현², 홍국선

서울대학교 재료공학부
¹한국과학기술연구원 세라믹스 연구부
²아주대학교 재료공학과

Origin of the Initial Permeability of Manganese-Zinc Ferrite Polycrytals

ABSTRACT

The origin of the variation of initial permeability in manganese-zinc ferrite polycrystals with a content of hematite was investigated. Initial permeability showed maximum with hematite content while there was no significant change in microstructure. Saturation magnetization increased with hematite content. So the variation of initial permeability was not explained on the basis of microstructural change or saturation magnetization. Temperature dependence of initial permeability revealed magnetocrystalline anisotropy was the origin of the variation of initial permeability. The change in magnetocrystalline anisotropy was ascribed to the variation in ferrous ion concentration. Therefore the variation of initial permeability in manganese-zinc ferrite polycrystals with a content of hematite was due to ferrous ion concentration via magnetocrystalline anisotropy.

Key words: Mn-Zn ferrite, Initial permeability, $Fe^{2+}$ ion concentration, Magnetocrystalline anisotropy, Microstructure