A Langmuir-Blodgett film presenting a ferromagnetic state below 25 K

A positively charged monolayer spread on a sub-phase containing copper hexa cyanoferrate leads to hybrid inorganic-organic LB films. Those multilayers present a spin ordering below 25 K. The Curie temperature of the LB films i s found to be independent of the multilayer thickness. Their magnetization is clearly proportional to the number of transferred layers, demonstrating that the deposition process is perfectly regular. These results show that a bulk ferromagnetic behavior can be observed in this hybrid material, even if the distance between magnetic layers is considered as large. (C) 1999 El sevier Science B.V. All rights reserved.