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

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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 {approx_equal} 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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Ohldag, Hendrik August 12, 2011.

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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 {approx_equal} 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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  • Journal Name: Submitted to New Journal Of Physics

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  • Report No.: SLAC-PUB-14356
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1022568
  • Archival Resource Key: ark:/67531/metadc846277

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Office of Scientific & Technical Information Technical Reports

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  • August 12, 2011

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Dec. 7, 2016, 8:45 p.m.

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Ohldag, Hendrik. The role of hydrogen in room-temperature ferromagnetism at graphite surfaces, article, August 12, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc846277/: accessed January 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.