Photoinduced Magnetization of a Cobalt-Iron Cyanide
O. Sato,
T. Iyoda,
A. Fujishima,
*
K. Hashimoto
*
Photoinduced magnetization was observed in a Prussian blue
analog, K0.2Co1.4-
[Fe(CN)6]·6.9H2O. An increase in the
critical temperature from 16 to 19 kelvin was observed as a result of
red light illumination. Moreover, the magnetization in the
ferrimagnetic region below 16 kelvin was substantially increased after
illumination and could be restored almost to its original level by
thermal treatment. These effects are thought to be caused by an
internal photochemical redox reaction. Furthermore, blue light
illumination could be used to partly remove the enhancement of the
magnetization. Such control over magnetic properties by optical stimuli
may have application in magneto-optical devices.
O. Sato and T. Iyoda, Kanagawa Academy of Science and Technology,
Tokyo Institute of Polytechnics 1583 Iiyama Atsugi, Kanagawa 243-02, Japan.
A. Fujishima, Department of Applied Chemistry, University of
Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan.
K. Hashimoto, Kanagawa Academy of Science and Technology, Tokyo
Institute of Polytechnics, 1583 Iiyama, Atsugi, Kanagawa 243-02, and
the Department of Applied Chemistry, University of Tokyo, 7-3-1 Hongo,
Bunkyo-ku, Tokyo 113, Japan.
*
To whom correspondence should be addressed.
