Process for regulating to desired values the dimensions of the bubbles of magnetic bubble elements
US4322454A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1980 |
| Grant date | Mar 30, 1982 |
| Priority date | — |
| Expiry date | Sep 24, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/90
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Process for regulating to desired values the size of the bubbles of magnetic bubble elements during the manufacture of such elements by liquid phase deposition into a non-magnetic substrate of a ferrimagnetic garnet film of formula: EQU (T.sub.a.sup.1 T.sub.b.sup.2 T.sub.c.sup.3 Ca.sub.d) (Fe.sub.e Ge.sub.g) O.sub.12 in which T.sup.1, T.sup.2 and T.sup.3, which differ from one another, represent an element in the series of rare earths, including yttrium, a,b,c and d are numbers such that their sum is substantially equal to 3 and e and f are numbers such that their sum is substantially equal to 5, wherein such elements are produced by using epitaxy baths comprising calcium oxide or carbonate and predetermined quantities of ferric oxide, oxides of elements T.sup.1, T.sup.2 and T.sup.3 and germanium oxide, wherein calcium carbonate or oxide quantity of each epitaxy bath is regulated as a function of the size of the bubbles which it is desired to obtain in the element produced from said bath and wherein the deposition of said element takes place at a temperature t.sub.d selected as a function of the saturation temperature T.sub.s of the bath to obtain a growth velocity adapted to the s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.