LOW MAGNETIC SATURATION GARNETS.
Quarterly progress rept. no. 6, 1 May-31 Jul 66,
SPERRY MICROWAVE ELECTRONICS CO CLEARWATER FLA
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Ten single crystal runs consisting of YCaVIG, BiCaVIG, YBiCaVIG and BiCaVAlIG were prepared and evaluated. Good quality crystals were grown in each of the four above garnet series. The temperature dependence of the first and second order magnetocrystalline anisotropy constants, and therefore the effective anisotropy field, of three different BiCaVIG compositions have been measured. The anisotropy field for these materials decreases linearly with increasing temperature - 180 to 25C. Polycrystalline samples of Y1.6Ca1.4V0.7AlwFe4.3-wO12 were prepared for w 0 to 0.5. Lattice constant, theoretical density, linewidth and magnetization for this series of compositions are reported. The temperature characteristics of the microwave properties for the Bi3-2yCa2yVyFe5-yO12 family are reported for y 1.1 to 1.4. A discussion of the discrepancy between the polycrystalline and single crystal magnetization measured on ostensibly the same composition is presented. Several possible explanations are presented, however, the problem remains unresolved. Bi0.4Ca2.6V1.3Fe3.7O12 single crystal and polycrystalline samples have been evaluated in an S-band Y-junction circulator. Operating characteristics are reported for 25C and 77K. Author
- Miscellaneous Materials