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In this report we have pointed out that magnetic hysteresis loop can be usedas a probe to distinguish a single layer from a many layer graphitic structure.Chemically we have synthesized graphitic oxide (GO) and reduced graphitic oxide(RGO) for this investigation. We observe ferromagnetic like hysteresis loopsfor both GO and RGO below a certain applied critical magnetic field and abovethis critical field we observe cross-over of the positive magnetization tonegative magnetization leading to diamagnetic behaviour. This cross-over ismore dominant for the case of many layer graphitic structure. Upon annealing ofGO in air the critical cross-over field decreases and the magnetizationincreases for multilayer graphitic structure. Possible reasons for all theseobservations and phenomena is presented here.

Magnetic hysteresis loop as a probe to distinguish single layer from many layer graphitic structure