Magnetic properties of Rb$_{j}$Co$_{4}$[Fe(CN)$_{6}$]$_{k}$$\cdot$$n$H$_{2}$O Prussian blue nanoparticles*

Magneto-optically active Prussian blue materials are of considerable interest because of their many possible applications.\footnote{J.-H. Park, E. {C}i\v{z}m\'{a}r, M. W. Meisel, Y. D. Huh, F. Frye, S. Lane, and D. R. Talham, Appl. Phys. Lett. \textbf{85}, 3797 (2004).} Nanoparticles of Rb$_{j}$Co$_{4}$[Fe(CN)$_{6}$]$_{k}$$\cdot$$n$H$_{2}$O have been synthesized, and TEM images indicate that clusters of 5 nm particles were obtained. Futhermore, the particles appear to show weak photo-induced effects similar to those reported in bulk materials. Here, we present preliminary data to illustrate the magnetic characteristics of these new materials. \linebreak J. Long was a NSF-REU participant (NSF CHE-0353828).