Accession Number:

ADA082539

Title:

Epitaxial Garnets and Hexagonal Ferrites.

Descriptive Note:

Final rept. 15 Jan 79-14 Jan 80,

Corporate Author:

ROCKWELL INTERNATIONAL ANAHEIM CA ELECTRONICS RESEARCH CENTER

Personal Author(s):

• Glass,Howard L.

Report Date:

1980-02-28

Pagination or Media Count:

7.0

Abstract:

The objective of this research is to develop new and improved epitaxial ferrite materials for use in microwave and millimeter-wave signal processing devices. The major emphasis has been on multiple layer epitaxial garnet structures for magnetostatic wave delay lines. Theoretical analysis was made for magnetostatic surface wave and magnetostatic forward volume wave propagation in structures containing two or three different magnetic garnet layers. Two-layer structures were prepared by liquid phase epitaxy using yttrium iron garnet as a high magnetization layer and lanthanum-gallium substituted yttrium iron garnet as a lower magnetization layer. Measurements of magnetostatic wave propagation at frequencies in the 1 GHz to 6 GHz range were generally in good agreement with the theory. For magnetostatic surface waves, non-dispersive delays of approximately 200 MHz bandwidth at a center frequency of 3 GHz are obtainable. Delay time can be varied from about 50 nseccm to 120 nseccm by choice of the layer thickness and magnetization. For magnetostatic forward volume waves, it appears to be possible to obtain 1 GHz bandwidths in linearly dispersive delay lines operating at X-band.

Descriptors:

• *EPITAXIAL GROWTH
• *GARNET
• *FERRITES
• SIGNAL PROCESSING
• SURFACE WAVES
• MILLIMETER WAVES
• MICROWAVES
• MICROWAVE EQUIPMENT
• WAVE PROPAGATION
• CRYSTAL GROWTH
• MAGNETOSTATICS

Subject Categories:

• Geology, Geochemistry and Mineralogy
• Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE