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Robust ferromagnetism in hydrogenated graphene mediated by spin-polarized pseudospin
- Robust ferromagnetism in hydrogenated graphene mediated by spin-polarized pseudospin
- Kim, Hyunyoung; Bang, Junhyeok; Kang, Joongoo
- DGIST Authors
- Kang, Joongoo
- Issue Date
- Scientific Reports, 8
- Article Type
- ROOM-TEMPERATURE FERROMAGNETISM; AUGMENTED-WAVE METHOD; POINT-DEFECTS; MAGNETISM; NANORIBBONS; GRAPHITE; MODEL
- The origin of the ferromagnetism in metal-free graphitic materials has been a decade-old puzzle. The possibility of long-range magnetic order in graphene has been recently questioned by the experimental findings that point defects in graphene, such as fluorine adatoms and vacancies, lead to defect-induced paramagnetism but no magnetic ordering down to 2 K. It remains controversial whether collective magnetic order in graphene can emerge from point defects at finite temperatures. This work provides a new framework for understanding the ferromagnetism in hydrogenated graphene, highlighting the key contribution of the spin-polarized pseudospin as a “mediator” of long-range magnetic interactions in graphene. Using first-principles calculations of hydrogenated graphene, we found that the unique ‘zero-energy’ position of H-induced quasilocalized states enables notable spin polarization of the graphene’s sublattice pseudospin. The pseudospin-mediated magnetic interactions between the H-induced magnetic moments stabilize the two-dimensional ferromagnetic ordering with Curie temperatures of Tc = nH × 34,000 K for the atom percentage nH of H adatoms. These findings show that atomic-scale control of hydrogen adsorption on graphene can give rise to a robust magnetic order. © 2018, The Author(s).
- Nature Publishing Group
- Related Researcher
Computational Materials Theory Group
Computational Materials Science ＆ Materials Design; Nanomaterials for Energy Applications; Theoretical Condensed Matter Physics
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- Department of Emerging Materials ScienceComputational Materials Theory Group1. Journal Articles
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