Anisotropy, geometric structure and frustration effects in molecule-based nanomagnets

G. Kamieniarz, P. Kozlowski, M. Antkowiak, P. Sobczak, T. Slusarski, D.M. Tomecka, A. Barasinski, B. Brzostowski, A. Drzewinski, A. Bienko, J. Mrozinski
Acta Physica Polonica A
121, 5-6, 992-998
Published while none of the authors were employed at the CMM


In this paper we review our results of comprehensive study of molecular nanomagnets recently synthesized in the form of the chromium-based molecules and bimetallic copper-containing chains as well as we present some new findings. We focus on effects of anisotropy, geometry and frustration appearing in various thermodynamic properties of the nanoscale magnets which are described by Heisenberg-like spin models and simulated by accurate numerical methods. We show that bond-dependent exchange anisotropy is needed to model magnetic torque in the Cd-doped chromium ring. We argue that only in the limit of infinite rings (n -> infinity) frustration can be considered as the opposite to bipartiteness in the odd numbered (3