Ferrite-Ferroelectric Composite Materials for Microwave and Millimeter Wave Device Applications
Abstract
A series of composite ferroelectric ferrite materials has been fabricated in order to investigate the basic properties which may lead to new microwave capabilities. The ferrite component was a Trans-Tech TT2-111 NiZn ferrite obtained in powder form. The ferroelectric component consisted of Paratek Type A and Type B Parascan(Trademark) materials. The ferroelectric component was nominally barium strontium titanate. The composite materials were prepared with 0.3 - 50 wt% ferrite, along with a 100 wt% ferrite material fired from the TT2-111 powder. These materials were used for low frequency and microwave dielectric constant and loss measurements, static magnetic characterization, ferromagnetic resonance, and high field microwave susceptibility measurements. The measurements indicate that such composites can, in fact, be fabricated and that the basic properties can be tuned through the mixing. Although much more materials development remains, the samples demonstrate that one can obtain a field tunable magnetic response through the ferrite component and a variable dielectric constant through the mixing. The specific microwave data show that the static magnetic properties scale with the ferrite content for loadings above 10 wt% or so. The microwave response data appear to scale with the ferrite loading, except for one critical result at 25 wt% loading. Further work is needed to determine the extent of a possible response enhancement for the ferrite based on the field concentrations induced by the ferroelectric. Further work is also needed to optimize the processing parameters and specific materials choices to obtain low dielectric loss and narrow ferromagnetic resonance linewidths.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2000
- Accession Number
- ADA378872
Entities
People
- Carl E. Patton
Organizations
- Colorado State University