MAGNETISM OF LARGE IRON-OXO CLUSTERS

The role of large iron-ore clusters in chemistry, material science, an d fundamental physics is briefly reviewed. Examples of clusters with n uclearity ranging from 6 to 19 are reported as well as their magnetic properties. Relevant topics, such as the role of spin topology and spi n frustration in antiferromagnetically coupled systems and the observa tion of superparamagnetic like behaviour and molecular hysteresis, are discussed. The use of strong magnetic fields in the characterization of magnetic clusters is emphasized and a theoretical approach for the rationalization of the magnetic properties of clusters is briefly repo rted.