Photoinduced Faraday effect in a cobalt-iron polycyanide film
Photoinduced Faraday effect in a cobalt-iron polycyanide film
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钴铁多氰化物薄膜中的光致法拉第效应
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
K. Hashimoto
中科院分区：
文献类型：
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作者：
Yusuke Sato;S. Ohkoshi;K. Hashimoto
我们报告了电化学合成的钴铁多氰化物薄膜中的光致法拉第效应。当 Na0.36Co1.36[Fe(CN)6] ⋅4.7H2O 薄膜受到氙灯照射时，法拉第旋转 (FR) 和法拉第椭圆率 (FE) 效应在 400–800 nm 光谱变化范围内突然出现。在 530 nm 处，FR 角从 0° 变为 -800° cm−1，尽管吸收系数仅发生了 30% 的变化（11×103→7.7×103 cm−1）。照射后，在 FR 和 FE 光谱中也观察到磁滞回线；矫顽场为3 kOe。目前的法拉第效应是由顺磁性 CoIII (S=0)−NC−FeII (S=0) 相到铁磁性 CoII (S=3/2)−NC−FeIII (S=1/2) 相的光致自旋跃迁引起的。此外，在法拉第光谱中观察到的跃迁被分配给 CoII 和 FeIII 之间通过氰基桥的间隔转移带。
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.