Domain wall resonance and its effect on losses in ferrites

Author

Gradzki, Pawel M. ; Lee, Fred C.

Author_Institution

Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA

fYear

1991

fDate

24-27 Jun 1991

Firstpage

627

Lastpage

632

Abstract

The core loss characterization in ferrites under strong magnetic fields is studied for high-frequency power converter applications. The measurements show strong dependence of core loss on the magnitude of DC or AC magnetic fields. An induced anisotropy field, due to material composition or applied bias field, causes multiple peaks in permeability and core loss characteristics at certain frequencies due to domain wall resonances. The characteristics of certain nickel-zinc ferrites, such as 4C4, degrade permanently after they are exposed to a strong magnetic field, which results in an irreversible alteration of the local magnetic anisotropies and their corresponding domain wall resonances

Keywords

ferrites; induced anisotropy (magnetic); magnetic cores; magnetic domain walls; magnetic leakage; magnetic permeability; power convertors; 4C4; AC magnetic fields; DC magnetic fields; Ni_1-xZn_xFe₂O₄; applied bias field; core loss; domain wall resonances; ferrites; high-frequency power converter; induced anisotropy field; losses; magnetic fields; nickel-zinc ferrites; permeability characteristics; Anisotropic magnetoresistance; Composite materials; Core loss; Ferrites; Loss measurement; Magnetic domain walls; Magnetic field measurement; Magnetic materials; Magnetic resonance; Permeability;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 1991. PESC '91 Record., 22nd Annual IEEE

Conference_Location

Cambridge, MA

Print_ISBN

0-7803-0090-4

Type

conf

DOI

10.1109/PESC.1991.162741

Filename

162741