Frequency Stability of the Initial Permeability of MnZn-Ferrites
The frequency stability of the initial permeability of MnZn-ferrites is limited by the gyromagnetic resonance (Snoeks law). However, in polycrystalline systems, for the same initial permeability, different levels of frequency stability can be achieved. Main tailoring parameters are composition, grain size, high resistivity doping phases along the grain boundaries, and the extent of dopant segregation. Model experiments were performed to quantify the effect of each parameter. In order to explain the results and to account for the permeability dependency on the specific resistivity, a modification of the nonmagnetic grain boundary (NMGB) model is proposed to a less magnetic grain boundary (LMGB) model, where not the thickness but the initial permeability of the grain boundary layer is the main variable that is affected by the process parameters.
MnZn-ferrites permeability frequency stability grain boundary resistivity model
D.Holz J.Hanuszkiewicz V.T.Zaspalis
Ferroxcube Polska,ul.Zwierzyniecka 2,96-100 Skierniewice,Poland Center for Research and Technology-Hellas,Chemical Process Engineering Research Institute,Laboratory
国际会议
The 10th International Conference on Ferrites(2008中国国际铁氧体研讨会)
成都
英文
169-172
2008-10-10（万方平台首次上网日期，不代表论文的发表时间）