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The temperature dependent sensitivity characteristic in the zeroth-order diffraction beam from the multidomain materials of BiXGdYY3−(X+Y)Fe5O12 films grown by a conventional liquid-phase-epitaxial method are studied. By measuring the variation of the sensitivity with temperature, it was found that films with X=1.3 and Y=0.43 show the minimum value of ±0.5% between 253 and 353 K. The contribution of the Gd substitution on the improvement of the temperature dependence of the sensitivity was explained by a simple theoretical calculation.

Highly accurate optical magnetic-field probe sensors that use iron garnet films have been developed. New probe-type sensors were designed with a confocal optical system. A new garnet composition, Bi(0.98)Gd(0.92)La(0.03)Y(1.07)Fe(4.72)Ga(0.28)O(12), was found that shows high temperature stability for a sensitivity of less than 2.0% from -20 to +80 degrees C. The linearity error of the sensor output was within 1.0% for alternating magnetic fields from 0.3 to 42 mT. An optical current transformer that uses the proposed sensor has an ac linearity of 1.0% for input current up to nearly 300 A. The sensor realized high performance in actual use.