BISMUTH-SUBSTITUTED RARE EARTH IRON GARNET SINGLE CRYSTAL, FARADAY ROTATOR, OPTICAL ISOLATOR, AND PRODUCTION METHOD FOR BISMUTH-SUBSTITUTED RARE EARTH IRON GARNET SINGLE CRYSTAL

摘要

Provided is a bismuth-substituted rare earth iron garnet single crystal that suppresses valence variation of Fe ions and is suitable in a Faraday rotator or optical isolator in which insertion loss is reduced. A bismuth-substituted rare earth iron garnet single crystal according to the present invention is characterized by being represented by the compositional formula (GdaLnbBicMg3-(a+b+c))(FedGaeTifPt5-(d+e+f))O12. In the compositional formula, 0.02 ≤ f ≤ 0.05, 0.02 ≤ {3-(a+b+c)} ≤ 0.08, and -0.01 ≤ {3-(a+b+c)}-{f+5-(d+e+f)} ≤ 0.01. Furthermore, Ln is a rare earth element that may be selected from Eu, Dy, Gd, Ho, Tm, Yb, Lu, and Y.