Abstract
We report on a photoinduced Faraday effect in an electrochemically synthesized cobalt-iron polycyanide film. When the Na0.36Co1.36[Fe(CN)6] ⋅4.7H2O film was irradiated with light from a Xe lamp, the Faraday rotation (FR) and Faraday ellipticity (FE) effects emerge suddenly over the 400–800 nm spectral change. The FR angle changed from 0° to −800° cm−1 at 530 nm although only 30% of the absorption coefficient changed (11×103→7.7×103 cm−1). After illumination, magnetic hysteresis loops were also observed in FR and FE spectra; The coercive field was 3 kOe. The present Faraday effect was caused by the photoinduced spin transition from the paramagnetic CoIII (S=0)−NC−FeII (S=0) phase to the ferromagnetic CoII (S=3/2)−NC−FeIII (S=1/2) phase. In addition, the observed transition in the Faraday spectra was assigned to the intervalence transfer band between CoII and FeIII through a cyano bridge.
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