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:
Apr. 26, 2016
Filed:
Nov. 10, 2011
Shuuji Oosumi, Tokyo, JP;
Yasutaka Nomi, Tokyo, JP;
Nobuo Nakamura, Tokyo, JP;
Hiroshi Hatanaka, Tokyo, JP;
Tomio Kajigaya, Tokyo, JP;
Shuuji Oosumi, Tokyo, JP;
Yasutaka Nomi, Tokyo, JP;
Nobuo Nakamura, Tokyo, JP;
Hiroshi Hatanaka, Tokyo, JP;
Tomio Kajigaya, Tokyo, JP;
SUMITOMO METAL MINING CO., LTD., Tokyo, JP;
Abstract
A bismuth-substituted rare-earth iron garnet crystal film (RIG) which has an insertion loss of less than 0.60 dB and which can be produced in a high yield, as well as an optical isolator, which is grown by liquid phase epitaxy on a non-magnetic garnet substrate represented by a chemical formula of Gd(ScGa)O, wherein the bismuth-substituted rare-earth iron garnet crystal film is represented by a chemical formula of LaGdBiFeO(provided that 0<x<3 and 0<y<3), and a composition ratio between the La, Gd, and Bi falls within a numeric value range corresponding to the inside of a quadrilateral having composition points A, B, C, and D as vertices in a La—Gd—Bi ternary composition diagram: composition point A (La: 0.15, Gd: 1.66, Bi: 1.19), composition point B (La: 0.32, Gd: 1.88, Bi: 0.80), composition point C (La: 0.52, Gd: 1.68, Bi: 0.80), and composition point D (La: 0.35, Gd: 1.46, Bi: 1.19).