The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 28, 1984
Filed:
Dec. 07, 1981
Stuart L Blank, Madison, NJ (US);
Virendra V Rana, Berkeley Heights, NJ (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
The use of vanadium on the tetrahedral site of a garnet material together with a suitable charge compensating ion, such as Ca.sup.2+, results in advantageous materials. In particular, very high Curie temperatures, e.g., up to 524 degrees C., in films capable of supporting 1 .mu.m-sized bubble domains, are observed. Additionally, the change of collapse field with temperatures for magnetic bubble domains in the garnet material is linear and closely parallels over a wide temperature range the change of bubble controlling static field of permanent magnets typically employed in magnetic bubble devices. A substantially constant bubble size is maintainable over a wide temperature range. The desired garnet compositions are produced advantageously from a melt containing a suitable ratio of vanadium to calcium.