Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1803377 | Journal of Magnetism and Magnetic Materials | 2006 | 4 Pages |
Abstract
The permittivity and permeability of composites filled with CrO2 powder are measured within the frequency range from 0.05 to 12Â GHz. A sharp line of magnetic absorption is detected near 8Â GHz. The effects of magnetic bias and remanence on the permittivity and permeability spectra are analyzed. The hysteretic behavior of dynamic permeability is observed for both parallel and perpendicular bias orientations relative to the microwave magnetic field. The effect is due to switching of the magnetic texture under bias equal to coercive field. At 50Â MHz the parallel bias close to coercive field affects permeability much stronger than the perpendicular one. At 10Â GHz the effect of perpendicular bias is higher than that of the parallel one. The effect of remanence on the microwave permeability is negligible. The 3Â kOe parallel bias suppresses the line of magnetic absorption and decreases the conductivity of the composite and its microwave permittivity. This can be attributed to the magnetostatic interaction of inclusions in the vicinity of the percolation threshold.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Sergey N. Starostenko, Konstantin N. Rozanov, Aleksey V. Osipov,