ABNORMAL FERROMAGNETIC BEHAVIOR FOR PYROLYTIC CARBON UNDER LOW-TEMPERATURE GROWTH BY CVD METHOD

Abnormal ferromagnetic behavior was found for the pyrolytic carbon obtained from adamantane as a raw material by CVD method under low temperature growth. An clear hysteresis loop in its magnetization curve was observed even at room temperature. Such a ferromagnetic behavior was reproducible. Both the highly oriented structure and a large number of unpaired electrons were observed and seem to play important role for this observed ferromagnetism. This ferromagnetic behavior should be intrinsic property of this pyrolytic carbon because any ferromagnetic impurities like Fe are not detected in these samples within experimental accuracy.