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

We report on the photomagnetic effect in ${\mathrm{Rb}}_{\text{0.91}}{\mathrm{Mn}}_{\text{1.05}}[{\mathrm{Fe(CN)}}_6\text{]⋅0.6}{\mathrm{H}}_2\mathrm{O}$ 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 $\text{P=43\hspace{0.17em}}{\mathrm{mJ cm}}^{\text{−2}} {\mathrm{pulse}}^{\text{−1}},$ 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.