Magnetic-statetuning of the rhombohedralgraphitefilm by interlayerspacing and thickness

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Based on first-principles total-energy calculations, we systematically investigate how the electronic and magnetic properties of rhombohedralgraphite thin films depend on the interlayerspacing and number of layers. Our calculations show that the magnetic ordering of the thin films depends on the interlayerspacing. Thin films under compression normal to the layers possess finite magnetic moments, indicating parallel spin coupling between the two surfaces. We also find that thin graphitefilms with seven or more atomic layers exhibit magnetic ordering while films with six or less atomic layers are metallic with no magnetic ordering.