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Permeability of Soft Magnetic FeCoV-Composites for Varying Filler Fractions

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2 Author(s)
Anhalt, M. ; Fac. of Natural & Mater. Sci., Clausthal Univ. of Technol., Clausthal-Zellerfeld, Germany ; Weidenfeller, B.

The dependence of permeability on the magnetic field in the initial magnetization curve for different Fe49 Co49V2-polymer composites is investigated. For a measurement frequency of f = 1 Hz and a low filler fraction of x = 0.1 the permeability is nearly constant with increasing magnetic field with a small maximum at H = 26100 A/m. Increasing filler fraction causes an increase of initial permeability and also the maximum permeability becomes more and more distinctive. Additionally the position of the maximum shifts to a lower magnetic field of H = 3027 A/m for filler fraction x = 0.8. At this filler fraction the maximum permeability is ¿max = 57 and the initial permeability is ¿i = 36. At the magnetic field where the maximum permeability was found also the frequency dependence from 1 Hz to 2000 Hz of the permeability was estimated. While the permeability is nearly constant in the whole examined frequency range for a filler fraction x ¿ 0.2, a higher filler fraction causes a reduction of permeability at higher frequencies. For the composite with 80-vol. % Fe49Co49V2 content the permeability is decreased for frequencies f > 100 Hz.

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Magnetics, IEEE Transactions on  (Volume:46 ,  Issue: 2 )