Magnetic Correlations at Graphene Edges: Basis for Novel Spintronics Devices

Oleg V. Yazyev and M. I. Katsnelson
Phys. Rev. Lett. 100, 047209 – Published 31 January 2008

Abstract

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=2100meVÅ2 and a spin-collinear domain wall creation energy Edw=114meV accompanied by low magnetic anisotropy. Above the crossover temperature Tx10K, the spin correlation length ξT1 limits the long-range magnetic order to 1nm 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.

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  • Received 1 November 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.047209

©2008 American Physical Society

Authors & Affiliations

Oleg V. Yazyev*

  • Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Theoretical Physics, CH-1015 Lausanne, Switzerland and Institut Romand de Recherche Numérique en Physique des Matériaux (IRRMA), CH-1015 Lausanne, Switzerland

M. I. Katsnelson

  • Institute for Molecules and Materials, Radboud University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands

  • *oleg.yazyev@epfl.ch

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Vol. 100, Iss. 4 — 1 February 2008

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