Pablo Esquinazi: "The role of hydrogen in the ferromagnetism of graphite" H. Ohldag, P. Esquinazi, E. Arenholz, D. Spemann, M. Rothermel, A. Setzer and T. Butz We present a x-ray dichroism study of graphite surfaces that addresses the origin and magnitude of ferromagnetism in metal free carbon. We find that, in addition to carbon $\pi$ states, also hydrogen-mediated electronic states exhibit a net spin polarization with significant magnetic remanence at room temperature. The observed magnetism is restricted to the top $\approx$10~nm of the sample where the actual magnetization reaches $ \simeq 15$~emu/g. We prove that the ferromagnetism found in metal-free {\em untreated} graphite is intrinsic and has a similar origin as the one found in proton bombarded graphite.