Title :
Effect of dopants on the magnetic properties of MnZn ferrites for high frequency power supplies
Author :
Znidarsic, A. ; Limpel, M. ; Drofenik, M.
Author_Institution :
Jozef Stefan Inst., Ljubljana Univ., Slovenia
fDate :
3/1/1995 12:00:00 AM
Abstract :
The effect of additions on the magnetic properties of MnZn ferrites for high frequency power supplies was studied. The investigation revealed that various combinations of dopants added to the ferrite modify the grain boundary resistivity and the magnetic permeability spectra at constant microstructure. Particularly, the combined effect of Sn/sup 4+/, Ti/sup 4+/ and Ta/sup 5+/ was found to increase the grain boundary resistivity in the ferrites studied and remarkably decrease the power loss at higher frequencies.<>
Keywords :
eddy current losses; electrical resistivity; ferrites; grain boundaries; magnetic hysteresis; magnetic impurities; magnetic leakage; magnetic permeability; manganese compounds; switched mode power supplies; zinc compounds; Mn/sub 0.66/Zn/sub 0.27/Fe/sub 2.07/O/sub 4/; dopants; eddy current loss; grain boundary resistivity; high frequency power supplies; hysteresis loops; magnetic permeability spectra; microstructure; power loss; switch mode power supplies; Conductivity; Electric resistance; Electrical resistance measurement; Ferrites; Frequency; Grain boundaries; Magnetic properties; Permeability; Power supplies; Switched-mode power supply;
Journal_Title :
Magnetics, IEEE Transactions on
