Title :
Microwave polymer-ferroxide film absorbers
Author :
Nedkov, I. ; Milenova, L. ; Dishovsky, N.
Author_Institution :
Inst. of Electron., Bulgarian Acad. of Sci., Sofia, Bulgaria
fDate :
11/1/1994 12:00:00 AM
Abstract :
The influence was studied of applying an external magnetic field on the microstructure and on the microwave magnetic and dielectric properties of thin-film absorbing structures containing two types of magnetic fillers. The frequency spectra between 7 and 17 GHz were obtained of the complex magnetic permeability μ* and the complex dielectric permittivity ε*. A strong dependence was established of the composite´s magnetic losses on the internal anisotropy field of the fillers. When the polymer containing a highly anisotropic filler was prepared in the presence of an external magnetic field, structural changes were observed that affected composite´s dielectric and magnetic properties
Keywords :
dielectric losses; dielectric thin films; magnetic anisotropy; magnetic impurities; magnetic leakage; magnetic permeability; permittivity; polymer films; 7 to 17 GHz; complex dielectric permittivity; complex magnetic permeability; dielectric properties; external magnetic field; internal anisotropy field; magnetic fillers; magnetic losses; microstructure; microwave polymer-ferroxide film absorbers; thin-film absorbing structures; Anisotropic magnetoresistance; Dielectrics; Magnetic anisotropy; Magnetic fields; Magnetic films; Magnetic properties; Microstructure; Microwave magnetics; Perpendicular magnetic anisotropy; Polymer films;
Journal_Title :
Magnetics, IEEE Transactions on
