Faraday rotator having a rectangular shaped hysteresis
US5898516A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1997 |
| Grant date | Apr 27, 1999 |
| Priority date | — |
| Expiry date | Jun 2, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/0322
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A Faraday rotator is formed of a bismuth-substituted iron garnet single crystal film grown by a liquid phase epitaxial method. The single crystal film is represented by a formula: Tb.sub.3-x Bi.sub.x Fe.sub.5-y-z Ga.sub.y Al.sub.z O.sub.12 wherein x has the range 1.1.ltoreq.x.ltoreq.1.5, y+z has the range 0.65.ltoreq.y+z.ltoreq.1.2, and z has the range z.ltoreq.y. The bismuth-substituted rare earth single crystal film is subjected to a magnetization process where the single crystal film is magnetized by an external magnetic field so that the film has a square magnetic hysteresis loop. The external magnetic field has a magnetic field strength of 1,000 Oe or higher and is applied in a direction normal to a surface of the bismuth-substituted rare earth iron garnet single crystal film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.