MAGNETIC PROPERTIES OF ORGANIC FERROMAGNETIC TDAE-C_(60) SINGLE CRYSTALS AND THIN FILMS

摘要

Recent progress in the study on magnetic properties of molecular soft ferromagnet TDAE-C_(60) (where TDAE is tetrakis(dimethylamino) ethylene) is reported. Both crystalline and thin film samples are prepared by the diffusion method and the temperature and field dependence of magnetization are studied by SQUID magnetometer. The magnetic behaviors of single crystals were found to vary from sample to sample. In best single crystals, the saturation magnetization as high as 1.0 μ_B/C_(60) has been observed. Spontaneous magnetization and its temperature dependence was evaluated from the Arrott plot. The ferromagnetic phase transition was also observed in TDAE-C_(60) thin films.