The influence of irradiation with white light on the permeability at 77thinsp;deg; ofnhyphen; andphyphen;type yttrium iron garnet films has been investigated. The investigations were performed on epitaxialy grown films with varying concentrations of Pb and Si. The existence of an ireversible photomagnetic effect in bothnhyphen; andphyphen;type YIG is demonstrated. Measurements of the spectral dependence of the photomagnetic effect in the wavelength region 1000ndash;3 nm show a rapid increase of the sensitivity towards shorter wavelengths.
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