Magnetoresistance effect in graphitising carbon fibres prepared by benzene decomposition

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Abstract
Magnetoresistance effects have been studied for graphitising carbon fibres heat-treated stepwise between 1100 degrees C and 3000 degrees C. The original carbon fibres were prepared by benzene decomposition at about 1100 degrees C. The relationship between the transverse magnetoresistance and heat treatment temperature (HTT) at a constant magnetic field is similar to that for other graphitising carbons. The positive magnetoresistance effect observed in the high HTT range for the present fibres is much stronger than that for the mesophase-pitch based carbon fibre possessing the highest graphitisability amongst commercial carbon fibres and even stronger than that for bulk graphitising carbons. The results indicate that a higher degree of graphitisation is attainable for the fibres. The effect of the orientation of the magnetic field on the magnetoresistance has been investigated in relation to the fibre structure.