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Abstract
Magnetoresonant softening of γ-irradiated KCl:Fe crystals controlled by visual light illumination was observed. Resonant magnetoplasticity detected by microhardness before illumination of the crystals is provided by two types of paramagnetic defects: (1) Fe2+-vc ion-vacancy pair with 7.0 and 3.5 g-factors, (2) Fe+ ions with g-factors equal to 2.2 and 4.1. Illumination of the γ-KCl:Fe crystals by λ=500–600 nm light causes disappearance of the electron paramagnetic resonance lines with 7.0 and 3.5 g-factors corresponding to Fe2+-vc resonances. The spectrum of the illuminated sample changes due to recombination of F-electrons with Fe2+-vc centers and their transformation to the Fe+ centers. Two lines with 2.2 and 4.1 g-factors corresponding to the Fe+ resonances were observed before and after light illumination.
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