Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 49, Issue 7, Pages 4319-4322Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2013.2249052
Keywords
Barium ferrites; ferromagnetic composites; ferromagnetic resonance; polymer composites
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Coarse and fine anisotropic hexagonal barium ferrite (BaFe12O19) powders and their composites with photoresist were prepared and characterized for high frequency microelectronic applications. Partially filled rectangular microwave ferrite structures were printed on silicon wafer by spin-casting technique from the negativephotoresist composites. A scanning electron microscope (SEM) was employed to characterize the surface morphology of the coarse and fine barium ferrite powders. Quasi-optical millimeter wave spectroscopy was used to measure the transmittance spectra of the ferrites and their photoresist composites in millimeter wave frequency range from 35 GHz to 75 GHz. The ferromagnetic resonance and absorption of powders and photoresist composites are investigated. Fine barium powder exhibits lower ferromagnetic resonant frequency than coarse barium powder due to the smaller particle size. But the photoresist composite of the fine barium shows same ferromagnetic resonance as the coarse powder photoresist composite.
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