Magnetic behaviour of polycrystalline TDAE-C-60

An organic ferromagnetic fullerene complex was prepared based on C-60 with tetrakisidmethylaminoethylene (TDAE). Temperature dependent X-band ESR meas urements on the TDAE-C-60 samples show strong single-line spectra without a ny hint to a hyperfine splitting. Magnetization measurements indicate ferro magnetic ordering below 16 K in all investigated TDAE-C-60 samples. After l eaving TDAE-C-60 powder in a sealed quartz tube with He for 8 weeks the zer o-field magnetization strongly increased. Typical extrinsic magnetic proper ties characterizing a ferromagnetic material such as hysteresis, coercivity and remanence were found at low temperatures.