Photo-induced magnetic effects in [MnR4TPP][TCNE]*2PhMe molecular magnet

Abstract

The photo-induced magnetic effects (PME) have been observed during the investigation into magnetic properties of [MnR4TPP][TCNE]*2PhMe (R = OC12H25, TPP tetraphenylporphyrin, TCNE tetracyanoethylene) charge transfer salt molecular magnet. The study of magnetic properties of [MnR4TPP][TCNE]*2PhMe and PME were performed in both static (DC) and dynamic (AC) modes with Lake Shore 7225 equipment using a sample probe with optical fiber. The Xe lamp with optical cut-off filters or the He-Ne laser was used. Results of DC magnetization relaxation measurements obtained for different magneticfields in He bath temperature (4.2 K) during illumination differ significantly from those obtained before illumination. Both the value and the time dependence of magnetization changed during illumination. Hysteresis loop measured before and during illumination was also found to undergo considerable change. On the other hand the AC measurements revealed only slight alteration in the real and imaginary components of the susceptibility. Simple theoretical description of the magnetization process recorded at 4.2 K, was performed and the relaxation data were found to be consistent with the model. © 2005 IOP Publishing Ltd.