One-shot-laser-pulse-induced demagnetization in rubidium manganese hexacyanoferrate

We report on the photomagnetic effect in Rb0.91Mn1.05[Fe(CN)(6)].0.6H(2)O ferromagnet. Magnetization of this system was reduced by irradiation with only one-shot of laser pulse (532 nm) at 3 K. This photodemagnetization was observed only when the laser power density (P) was above 9.3 mJ cm-2 pulse-1. The quantum yield was above one and reached 4.5 at P=43 mJ cm(-2) pulse(-1), showing that this phenomenon is driven by a cooperative effect such as the photoinduced domino effect. Infrared spectra before and after the irradiation indicated that this photomagnetic effect was caused by a photoinduced phase transition from the Fe(II)-CN-Mn(III) phase to the Fe(III)-CN-Mn(II) phase. (C) 2003 American Institute of Physics.