Magnetic Bubble Materials
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 11, 1973
- Accession Number
- AD0767299
Entities
People
- Jerry W. Moody
- Joseph T. Cheng
- Michael C. Willson
- Robert M. Sandfort
- Roger W. Shaw
Organizations
- Monsanto