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Atomic-scale control of graphene magnetism by using hydrogen atoms

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Science  22 Apr 2016:
Vol. 352, Issue 6284, pp. 437-441
DOI: 10.1126/science.aad8038

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  • On the long range magnetic coupling in hydrogenated graphene
    • Qiang Sun, Professor, Peking University
    • Other Contributors:
      • Puru Jena, Professor, Virginia Commonwealth University

    We have read the recent paper in Science entitled “Atomic-scale control of graphene magnetism by using hydrogen atoms” (Science 352, 437, 2016), where H atoms were introduced to one side of graphene sheet supported on a SiC surface, resulting in a semihydrogenated graphene sheet with ferromagnetic coupling.

    The main idea and conclusions of this paper are quite similar to our predictions made in 2009, which was published in Nano Letters with the title “Ferromagnetism in Semihydrogenated Graphene Sheet” (Nano Letters 9, 3867, 2009). On page 3869, we pointed out “the unpaired 2p electrons in the unhydrogenated carbon sites contribute to magnetism. Since the valence electrons in p-states are more delocalized than those in d- or f-states, they have much larger spatial extension that promotes long range exchange coupling interaction. Therefore, the long range magnetic coupling between 2p moments can be attributed to the extended p-p interactions”.The experimental observations and DFT calculations presented in the above Science article confirm our prediction; mainly that the H-induced magnetic moments with AA configuration can ferro-magnetically couple across long range. By comparing their figures 2D and 4G with our figure 4 in the attached paper, one can clearly see the same physics and mechanism.

    Unfortunately, the authors of the Science paper failed to cite our paper. We post this message here so that the readers are aware of the past progress made on th...

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    Competing Interests: None declared.

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