Frequency Dependence of Complex Permeability of Polycrystalline Ferrites Based on the Realities of Microstructure

2013 ◽  
Vol 543 ◽  
pp. 507-510 ◽  
Author(s):  
Janis Jankovskis ◽  
Nikolajs Ponomarenko ◽  
Deniss Stepins
Keyword(s):  
Grain Size ◽  
Low Temperature ◽  
Frequency Dependence ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Complex Permeability ◽  
Absorption Component ◽  
Resonance Character ◽  
Explicit Relation

Complex permeability spectra of polycrystalline ferrites are analyzed on the basis of the model accounting for the effects of their grain size distribution (GSD). The model allows for explicit relation for absorption component. It shows, that by change of only one parameter (related with GSD) it is possible to turn from the relaxation to resonance character of spectrum, that spectra of ferrites, sintered at low temperature, tend to the most theoretical type - symmetrical one.

Complex Permeability of Ferrites Correlated with their Microstructure

2006 ◽  
Vol 45 ◽  
pp. 2560-2565 ◽  
Author(s):  
Janis Jankovskis
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Initial Permeability ◽  
The Other ◽  
Complex Permeability ◽  
Polycrystalline Ferrite

The totality of spinel and garnet polycrystalline ferrite (PF) samples is divided in two subgroups in process of their complex initial permeability (including the static value) relating to their microstructure (MS). The analysis for the first, including PF of rather perfect MS brings to explicit relations showing the effects of grain size distribution. For the other, the group of typical PF, the observed effects is possible to evaluate basing on the results gained for the first group.

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