How to increase the diamagnetic magnetic force of HOPG

HOPG (Highly Oriented Pyrolytic Graphite) means highly oriented graphite. The diamagnetic current that flows through the hexagonal mesh surface of the carbon that constitutes it causes the HOPG diamagnetism. The diamagnetic force changes depending on the direction of the outer magnetic field and the direction of the hexagonal mesh surface of carbon. We show that the combination of cylindrical HOPG and HOPG disk can increase the diamagnetic force in the axial direction of the HOPG disk.