LOW MAGNETIC SATURATION GARNETS.
Rept. no. 8, 1 Feb 65-31 Jan 67 (Final),
SPERRY MICROWAVE ELECTRONICS CO CLEARWATER FLA
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A new family of single and polycrystalline low saturation magnetization garnets have been extensively investigated. The compositions, growth techniques, and results obtained from 72 single crystal runs of BiCaVIG and 24 crystal runs of YCaVIG are discussed in detail. An optimized process for growing BiCaVIG single crystals is described which has produced crystals of up to 12 inch in size from 250 gram melts. Linewidth and magnetization data are reported as a function of temperature for many of these materials. Values of anisotropy field measured as a function of temperature are compared for BiCaVIG, YGaIG, and YIG. Potential device applications of BiCaVIG materials are evaluated by comparing their operating characteristics in a gyromagnetic coupling filter with those of YGaIG. Single crystal and polycrystalline BiCaVIG samples are also evaluated in an S-band Y-junction circulator. An optimized preparation procedure is described for processing single phase, low loss polycrystalline Bi and YCaVIG materials. Linewidth, magnetization, and geff factor are reported as a function of temperature for many of these compounds. Photomicrographs of both single phase and polyphase materials are presented for comparison purposes. Hybrid compositions containing Gd, Li, Al and Cu are discussed. Y-GdCaVIG materials possessed temperature stable magnetizations in the range of 200 to 800 gauss.
- Electricity and Magnetism
- Solid State Physics
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