Magnetism in nanoscale graphite flakes as seen via electron spin resonance

被引：15

作者：

Ciric, Luka ^{[1
]}

Djokic, Dejan M. ^{[1
]}

Jacimovic, Jacim ^{[1
]}

Sienkiewicz, Andrzej ^{[1
]}

Magrez, Arnaud ^{[1
]}

Forro, Laszlo ^{[1
]}

Sljivancanin, Zeljko ^{[2
]}

Lotya, Mustafa ^{[3
]}

Coleman, Jonathan N. ^{[3
]}

机构：

[1] Ecole Polytech Fed Lausanne, ICMP, CH-1015 Lausanne, Switzerland

[2] Vinca Inst Nucl Sci 020, RS-11001 Belgrade, Serbia

[3] Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 20期

关键词：

CARBON NANOTUBES; GRAPHENE; FERROMAGNETISM; EXFOLIATION; DEFECTS; ESR;

D O I：

10.1103/PhysRevB.85.205437

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic properties of a large assembly of ultrathin graphitic particles obtained by heavy sonication of graphite powder dispersed in N-methylpyrrolidone were measured by electron-spin resonance (ESR). The ESR signal was decomposed into one narrow and one broad component. The narrow component was associated with localized Curie-type defects. The temperature dependence of the predominant broad component points to a transition to a superparamagnetic-like state at 25 K. By performing the density-functional-theory calculations for graphene with selected extended defects (the sheet edges, zigzag chains of chemisorbed H atoms, and pentagon-octagon rows), we found considerable magnetic moments at C atoms in their vicinities. We attribute the magnetism in the graphitic particles to the localized electronic states near the defects in the network of the p electrons of graphene. The ferromagnetic (FM) correlations among magnetic moments at carbon atoms near the edges are not able to give rise to a long-range FM order.

引用

页数：6

共 35 条

[1] SUSCEPTIBILITY AND FLUCTUATIONS IN ISING FERROMAGNET [J].

ABRAHAM, DB .

PHYSICS LETTERS A, 1973, A 43 (02) :163-164

[2] ORGANIC MOLECULAR SOFT FERROMAGNETISM IN A FULLERENE-C60 [J].

ALLEMAND, PM ;

KHEMANI, KC ;

KOCH, A ;

WUDL, F ;

HOLCZER, K ;

DONOVAN, S ;

GRUNER, G ;

THOMPSON, JD .

SCIENCE, 1991, 253 (5017) :301-303

[3] Carbon-based electronics [J].

Avouris, Phaedon ;

Chen, Zhihong ;

Perebeinos, Vasili .

NATURE NANOTECHNOLOGY, 2007, 2 (10) :605-615

[4] 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)

[5] Modification of multiwall carbon nanotubes by electron irradiation:: An ESR study [J].

Beuneu, F ;

l'Huillier, C ;

Salvetat, JP ;

Bonard, JM ;

Forró, L .

PHYSICAL REVIEW B, 1999, 59 (08) :5945-5949

[6] PROJECTOR AUGMENTED-WAVE METHOD [J].

BLOCHL, PE .

PHYSICAL REVIEW B, 1994, 50 (24) :17953-17979

[7] Room-temperature ferromagnetism in graphite driven by two-dimensional networks of point defects [J].

Cervenka, J. ;

Katsnelson, M. I. ;

Flipse, C. F. J. .

NATURE PHYSICS, 2009, 5 (11) :840-844

[8] ESR study of potassium-doped aligned carbon nanotubes [J].

Chauvet, O ;

Baumgartner, G ;

Carrard, M ;

Bacsa, W ;

Ugarte, D ;

deHeer, WA ;

Forro, L .

PHYSICAL REVIEW B, 1996, 53 (21) :13996-13999

[9]

Ciric L., IN PRESS

[10] Electronic structure calculations with GPAW: a real-space implementation of the projector augmented-wave method [J].

Enkovaara, J. ;

Rostgaard, C. ;

Mortensen, J. J. ;

Chen, J. ;

Dulak, M. ;

Ferrighi, L. ;

Gavnholt, J. ;

Glinsvad, C. ;

Haikola, V. ;

Hansen, H. A. ;

Kristoffersen, H. H. ;

Kuisma, M. ;

Larsen, A. H. ;

Lehtovaara, L. ;

Ljungberg, M. ;

Lopez-Acevedo, O. ;

Moses, P. G. ;

Ojanen, J. ;

Olsen, T. ;

Petzold, V. ;

Romero, N. A. ;

Stausholm-Moller, J. ;

Strange, M. ;

Tritsaris, G. A. ;

Vanin, M. ;

Walter, M. ;

Hammer, B. ;

Hakkinen, H. ;

Madsen, G. K. H. ;

Nieminen, R. M. ;

Norskov, J. K. ;

Puska, M. ;

Rantala, T. T. ;

Schiotz, J. ;

Thygesen, K. S. ;

Jacobsen, K. W. .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2010, 22 (25)

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