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Measurement of the magnetooptic properties of bismuth-substituted iron garnet films using piezobirefringent modulation

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Abstract

A magnetooptic spectrometer is described which makes use of a piezobirefringent (photoelastic) modulator. In a special configuration of the optical components the spectrometer yields simultaneously the magnetooptic rotation and ellipticity induced by the sample. All functions of the spectrometer are automatically controlled by a microcomputer. The typical resolution in the magnetooptic Faraday and Kerr rotations is 10−2 deg and in the Faraday and Kerr ellipticities is 10−3 deg. The performance of the spectrometer is assessed on liquid-phase iron garnet films of composition Y3−xyBixPbyFe5−zPtzO12 whose polar magnetooptic Faraday and Kerr spectra are reported in the photon energy range 0.7–4.8 eV (λ = 1800–260-nm wavelength) and compositional range 0 ⩽ x ⩽ 1.42. The impurity content in the films is y ⩽ 0.08 and z ⩽ 0.04. A comparison with data from literature shows a satisfactory agreement with this work. Deviations may be due to distinct differences in the material technology and in the precision of the chemical analysis. The investigated films are identical with those reported earlier from this laboratory in order to yield a consistent picture in the optical, magnetooptic, and magnetic properties.

© 1984 Optical Society of America

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