A Model of Single Molecule Magnet Behavior of the [Cu^IILTb^III(hfac)₂]₂ Cluster

Abstract

We report a model for the explanation of the single molecule magnet behavior of the [CuIILTbIII(hfac)2]2 cluster. The model takes into account the crystal field acting on the TbIII –ion and the exchange interaction between the TbIII and CuII ions. The energies of the low-lying levels are shown to increase with the decrease of the mean value of the z-projection of the total angular momentum of the cluster, thus forming a barrier for magnetization reversal that is in accordance with the experimental evidence.

Magnetic Anisotropy in the [CuIILTbIII(hfac)2]2Single Molecule Magnet: Experimental Study and Theoretical Modeling

“…The role of exchange interaction between the Cu and Tb ions was not explored. An initial attempt to understand the unusual magnetic behavior of the [Cu II LTb III (hfac) 2 ] 2 compound was undertaken in our recent article . However the model in this earlier work gives an overestimated value of exchange interaction for intermetallic 4f−3d pairs.…”