Superparamagnetic behavior of C 60Fe
Abstract
A large value of the Curie constant and field dependence of magnetization of C 60Fe sample point to the existence of superparamagnetic interaction in the compound. The observed nonequilibrium effects can be interpreted within the framework of the superparamagnetic blocking model, if one assumes that the solid consists of clusters (composed of many C 60Fe complexes) that have large magnetic moments. A wide temperature range of irreversible magnetization of the C 60Fe samples and a broad maximum of the susceptibility temperature dependence suggest the distribution of the cluster size. Semiempirical quantum chemical calculations show that C 60Fe complexes might adopt high spin state.
- Publication:
-
Journal of Magnetism and Magnetic Materials
- Pub Date:
- December 2000
- DOI:
- 10.1016/S0304-8853(00)00539-4
- Bibcode:
- 2000JMMM..222...89Z