Format

Send to

Choose Destination
Phys Rev Lett. 2008 Feb 1;100(4):047209. Epub 2008 Jan 31.

Magnetic correlations at graphene edges: basis for novel spintronics devices.

Author information

1
Ecole Polytechnique Fédérale de Lausanne, Institute of Theoretical Physics, CH-1015 Lausanne, Switzerland. oleg.yazyev@epfl.ch

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=2100 meV A2 and a spin-collinear domain wall creation energy E(dw)=114 meV accompanied by low magnetic anisotropy. Above the crossover temperature T(x) approximately 10 K, the spin correlation length xi proportional, variantT(-1) limits the long-range magnetic order to approximately 1 nm at 300 K while below T(x), it grows exponentially with decreasing temperature. We discuss possible ways of increasing the range of magnetic order and effects of edge roughness on it.

Supplemental Content

Full text links

Icon for American Physical Society
Loading ...
Support Center