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

Volume

31

Issue

2

fYear

1995

fDate

3/1/1995 12:00:00 AM

Firstpage

950

Lastpage

953

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.364767

Filename

364767