Magnetic correlations at graphene edges: Basis for novel spintronics devices

被引：628

作者：

Yazyev, Oleg V. ^{[1
,2
]}

Katsnelson, M. I. ^{[3
]}

机构：

[1] Ecole Polytech Fed Lausanne, Inst Theoret Phys, CH-1015 Lausanne, Switzerland

[2] Inst Romand Rech Numer Phys Mat, IRRMA, CH-1015 Lausanne, Switzerland

[3] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 ED Nijmegen, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.100.047209

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 angstrom(2) and a spin-collinear domain wall creation energy E-dw=114 meV accompanied by low magnetic anisotropy. Above the crossover temperature T-x approximate to 10 K, the spin correlation length xi proportional to T-1 limits the long-range magnetic order to similar to 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.

引用

页数：4

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