Accession Number:

AD0767299

Title:

Magnetic Bubble Materials

Descriptive Note:

Final rept. 11 Jan-11Jul 1973

Corporate Author:

MONSANTO RESEARCH CORP ST LOUIS MO

Report Date:

1973-08-11

Pagination or Media Count:

65.0

Abstract:

The Czochralski growth of defect-free, non-magnetic garnet crystals and the preparation of epitaxial magnetic bubble garnet films by liquid phase epitaxy LPE and arc-plasma spraying APS were investigated. Two garnet systems, Eu-Yb-Y and Sm-Y, were identified as being of particular practical interest. These garnets exhibit reasonable mobilities, satisfactory quality factors, and good temperature stability. Device-quality films can be deposited by LPE from PbO-B2O3 solution on 111 GGG substrates. Methods were developed for growing epitaxial garnet films by APS. However, the films were usually contaminated with crystallites of orthoferrite, hematite, magnetoplumbite or other phases. Low defect density films were not prepared and the elimination of unwanted phases by compositional control appears to be a formidable problem. All recent developments indicate that the LPE dipping growth of garnet films is a commercially viable process. Core free single crystals of GGG with defect densities of less than 5 per sq cm can be grown readily by the Czochralski method. Such crystals, up to 38 mm in diameter, are now available commercially.

Subject Categories:

  • Fabrication Metallurgy
  • Computer Hardware
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE