DocumentCode :
1192015
Title :
High-frequency resistivity of soft magnetic granular films
Author :
Li, Weidong ; Sun, Yuqin ; Sullivan, Charles R.
Author_Institution :
Thayer Sch. of Eng., Dartmouth Coll., Hanover, NH, USA
Volume :
41
Issue :
10
fYear :
2005
Firstpage :
3283
Lastpage :
3285
Abstract :
Co-Zr-O granular films were prepared by reactive sputtering. The films show strong uniaxial in-plane anisotropy as well as good soft magnetic properties and high dc resistivity. In order to confirm their electrical characteristics at high frequency, the frequency and current density dependences of resistivity were investigated. Resistivity was found to be constant over the range measured (up to 18 MHz and 100 MA/m2). Furthermore, the films exhibit virtually no hysteresis along the hard-axis direction and have very little anisotropy dispersion. The frequency dependence of the initial permeability was measured and used to predict the power loss expected when granular films are used as high-frequency core materials for film inductors. The power loss is predicted to be lower than that of commercial NiZn ferrite for high-frequency applications.
Keywords :
electrical resistivity; granular materials; magnetic anisotropy; magnetic cores; magnetic permeability measurement; magnetic thin films; soft magnetic materials; sputtering; thin film inductors; anisotropy dispersion; current density; film inductor; frequency dependence; high dc resistivity; high-frequency core material; high-frequency resistivity; initial permeability; magnetic granular film; magnetic permeability; power loss; reactive sputtering; soft magnetic film; soft magnetic property; uniaxial in-plane anisotropy; Anisotropic magnetoresistance; Conductivity; Ferrite films; Frequency; Magnetic anisotropy; Magnetic films; Magnetic properties; Perpendicular magnetic anisotropy; Soft magnetic materials; Sputtering; Granular film; high-frequency resistivity; initial permeability; power loss; soft magnetic film;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2005.854720
Filename :
1519280
Link To Document :
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