ИСТИНА

In the lecture, the structure and magnetic properties of single ion magnets (SIM) related to Co(II) complexes have been considered. Particular attention has been paid to the results of experiments and theoretical modeling of hexacoordinated complexes of Co(II) with negative and positive magnetic anisotropy, which we have obtained recently1,2. To analyze magnetic anisotropy of these complexes, additional experimental techniques, such as SQUID magnetometry and EPR spectroscopy have been used, as well as theoretical modeling using parametrized Griffith’s Hamiltonian with parameters obtained from ab initio calculations. As follows from the analysis, magnetic anisotropy of these complexes is mainly triaxial, with different signs of axial components. Independently on the sign of the axial anisotropy, Co(II) complexes exhibit a slow paramagnetic relaxation in the constant magnetic (DC) field, i.e., belong to the class of field induced non-monoaxial single ion magnets (FI-SIMs). Such type of SIM behavior is due to Kramer’s character of Co(II) ion1,2. Possibility to produce new magnetic materials based on these compounds is being discussed.