Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.334, 415-424, 1999
Ferromagnetism below 19 K due to unpaired spins on fullerene molecules
We report on synthesis and physical properties of a fullerene (3-aminophenyl)-1H-1,2-methano-[60]-fullerene-cobaltocene, a molecular organic ferromagnet, with a Curie temperature of 19 K. Near-infrared, mid-infrared and electron spin resonance spectra show that Spins reside entirely on the fullerene units from which we deduce that the ferromagnetism is a consequence of the ordering of spins solely on the fullerene units. The ferromagnetic state of the compound is characterized by a low saturation field of 40 oersted and a hysteresis of less than 1 oersted.