Numéro
J. Phys. IV France
Volume 07, Numéro C1, Mars 1997
7th INTERNATIONAL CONFERENCE ON FERRITES
Page(s) C1-557 - C1-558
DOI https://doi.org/10.1051/jp4:19971230
7th INTERNATIONAL CONFERENCE ON FERRITES

J. Phys. IV France 07 (1997) C1-557-C1-558

DOI: 10.1051/jp4:19971230

High Frequency Permeability of Mn-Zn Ferrite and its Composite Materials

T. Tsutaoka1, T. Kasagi1, T. Nakamura2 and K. Hatakeyama3

1  Physics Laboratory, Faculty of School Education, Hiroshima University, 1-1-1, Kagamiyama, Higashi-Hiroshima 739, Japan
2  R&D Division, Toda Kogyo Corporation, Funairi-minami, Hiroshima 730, Japan
3  Resources & Environment Protection Research Laboratories, NEC Corporation, Miyazaki, Miyamae-ku Kawazaki, Kanagawa 213, Japan


Abstract
Complex permeability spectra (μ*=μ'-iμ") in Mn-Zn ferrite and its composite materials have been studied. In sintered ferrite, resonance-type frequency dispersion was observed at room temperature but decrement of μ' is steeper than that of ordinary resonance. As the temperature is decreased, onset frequency of dispersion shifts higher and dispersion character changes to relaxation-type. In ferrite composite materials, relaxation characters were also observed at low volume loading samples. Since Mn-Zn ferrite has relatively high electrical conductivity at room temperature, high frequency permeability is suppressed by eddy current. However, lowering of temperature and reduction of ferrite content result in the decrease of eddy current; magnetic resonance such as relaxation-type spin rotational one appears in high frequency region.



© EDP Sciences 1997