| 摘要 |
PROBLEM TO BE SOLVED: To enable an alternating-current magnetic field measuring Faraday rotor to be kept high in sensitivity linearity even to an alternating-current magnetic field of a few oersteds or below, by a method wherein a bismuth- substituted rare earth iron garnet single crystal film is grown on a non-magnetic garnet board tilted at a specific angle to a (111) plane orientation through a liquid phase epitaxial method. SOLUTION: One side of a garnet single crystal board which is possessed of a lattice constant of 1.2495±0.0005 nm and tilted at an angle of 0.5 deg. or below to a (111) board plane orientation is brought into contact with the surface of a melting liquid for growing a bismuth-substituted rare earth iron garnet single crystal to start an epitaxial growth process. At this point, it is preferable that the composition formula of a bismuth-substituted rare earth iron garnet single crystal is represented by (RBi)3 (FeA)5 O12 (R denotes an element selected out of Y, La, Ce, Pr, Nb, Sm and the like). By this setup, an alternating-current magnetic field measuring Faraday rotor can be kept high in linearity of sensitivity to a very weak alternating-current magnetic field.
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