2007/11/01 by Oleg V. Yazyev, M. I. Katsnelson · 4 citations
Materials Science · Physics and Astronomy · #Graphene research and applications #Magnetic properties of thin films #Quantum and electron transport phenomena #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevlett.100.047209
published as Phys. Rev. Lett. 100, 047209 (2008) · 4 pages, 4 figures
arxiv created 2007/11/01 · openalex publication_date 2008/01/31 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
Magnetic zigzag edges of graphene are considered as a basis for novel spintronics devices despite the fact that no true long-range magnetic order is possible in one dimension. We study the transverse and longitudinal fluctuations of magnetic moments at zigzag edges of graphene from first principles. We find a high value for the spin wave stiffness D=2100 meV \AA2 and a spin-collinear domain wall creation energy Edw=114 meV accompanied by low magnetic anisotropy. Above the crossover temperature Tx\ensuremath≈10 K, the spin correlation length \ensuremathξ\ensuremath∝T^\ensuremath-1 limits the long-range magnetic order to \ensuremath∼1 nm at 300 K while below Tx, it grows exponentially with decreasing temperature. We discuss possible ways of increasing the range of magnetic order and effects of edge roughness on it.