The role of hydrogen in room-temperature ferromagnetism at graphite surfaces

Details The role of hydrogen in room-temperature ferromagnetism at graphite surfaces The role of hydrogen in room-temperature ferromagnetism at graphite surfaces

2009-05-27

arxiv.org/abs/0905.4315v2

Physics

Condensed Matter

Materials Science

10 pages, 5 figures, 1 table, submitted to New Journal of Physics

Scientific paper

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 irradiated sample where the actual magnetization reaches $ \simeq 15$ emu/g at room temperature. We prove that the ferromagnetism found in metal-free untreated graphite is intrinsic and has a similar origin as the one found in proton bombarded graphite.

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