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

共 37 条

[1] Experimental evidence for two-dimensional magnetic order in proton bombarded graphite [J].

Barzola-Quiquia, J. ;

Esquinazi, P. ;

Rothermel, M. ;

Spemann, D. ;

Butz, T. ;

Garcia, N. .

PHYSICAL REVIEW B, 2007, 76 (16)

[2] Diluted graphene antiferromagnet [J].

Brey, L. ;

Fertig, H. A. ;

Das Sarma, S. .

PHYSICAL REVIEW LETTERS, 2007, 99 (11)

[3] High-temperature ferromagnetism of sp electrons in narrow impurity bands:: application to CaB6 [J].

Edwards, D. M. ;

Katsnelson, M. I. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2006, 18 (31) :7209-7225

[4] Induced magnetic ordering by proton irradiation in graphite -: art. no. 227201 [J].

Esquinazi, P ;

Spemann, D ;

Höhne, R ;

Setzer, A ;

Han, KH ;

Butz, T .

PHYSICAL REVIEW LETTERS, 2003, 91 (22)

[5] SYMMETRY CROSSOVER IN THE ONE-DIMENSIONAL HEISENBERG-FERROMAGNET [J].

FARIA, AC ;

PIRES, AST .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1979, 12 (13) :2637-2644

[6] Magnetism in graphene nanoislands [J].

Fernandez-Rossier, J. ;

Palacios, J. J. .

PHYSICAL REVIEW LETTERS, 2007, 99 (17)

[7] MAGNETISM IN 1-DIMENSIONAL SYSTEMS - HEISENBERG MODEL FOR INFINITE SPIN [J].

FISHER, ME .

AMERICAN JOURNAL OF PHYSICS, 1964, 32 (05) :343-+

[8] Ferromagnetism in one-dimensional monatomic metal chains [J].

Gambardella, P ;

Dallmeyer, A ;

Maiti, K ;

Malagoli, MC ;

Eberhardt, W ;

Kern, K ;

Carbone, C .

NATURE, 2002, 416 (6878) :301-304

[9] Magnons in real materials from density-functional theory [J].

Gebauer, R ;

Baroni, S .

PHYSICAL REVIEW B, 2000, 61 (10) :R6459-R6462

[10] The rise of graphene [J].

Geim, A. K. ;

Novoselov, K. S. .

NATURE MATERIALS, 2007, 6 (03) :183-191

← 1 2 3 4 →