Magnetism in monatomic metal wires

被引：49

作者：

Gambardella, P ^{[1
]}

机构：

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

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2003年 / 15卷 / 34期

关键词：

D O I：

10.1088/0953-8984/15/34/305

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The first investigation of magnetism in one-dimensional (ID) monatomic chains of metal atoms is reported. High-density arrays (5 x 10(6) cm(-1)) of parallel Co atomic wires have been grown using the vicinal Pt(997) surface as a template. Angle-resolved photoemission experiments evidence the presence of a 3d exchange-split band for the Co wires giving rise to enhanced localized spin magnetic moments. X-ray magnetic circular dichroism shows further that the orbital magnetic moment is about five times larger compared to that of bulk hcp Co as a result of the reduced atomic coordination of the 1D wires. Whereas statistical models forbid long-range ferromagnetic order in infinite 1 D spin chains at any temperature greater than zero, we show that finite monatomic Co chains display both short- and long-range ferromagnetic order. The chains consist of thermally fluctuating segments of ferromagnetically coupled atoms which evolve into a ferromagnetic metastable long-range-ordered state below 15 K. Ferromagnetism in 1D is stabilized by unusually large magnetic anisotropy energy barriers (2 meV/atom) which arise from the reduced dimensionality of the wires and related large orbital magnetization.

引用

页码：S2533 / S2546

页数：14

共 74 条

[1] EXCHANGE-SPLIT ELECTRONIC STATES OF ULTRATHIN CO LAYERS ON CU(111) [J].

ALKEMPER, U ;

CARBONE, C ;

VESCOVO, E ;

EBERHARDT, W ;

RADER, O ;

GUDAT, W .

PHYSICAL REVIEW B, 1994, 50 (23) :17496-17501

[2] Orbital magnetism and magnetic anisotropy probed with ferromagnetic resonance [J].

Anisimov, AN ;

Farle, M ;

Poulopoulos, P ;

Platow, W ;

Baberschke, K ;

Isberg, P ;

Wäppling, R ;

Niklasson, AMN ;

Eriksson, O .

PHYSICAL REVIEW LETTERS, 1999, 82 (11) :2390-2393

[3] FERROMAGNETISM OF ULTRATHIN FILMS [J].

BANDER, M ;

MILLS, DL .

PHYSICAL REVIEW B, 1988, 38 (16) :12015-12018

[4] One-dimensional magnetism of Rh chains on the Ag(001) surface [J].

Bazhanov, DI ;

Hergert, W ;

Stepanyuk, VS ;

Katsnelson, AA ;

Rennert, P ;

Kokko, K ;

Demangeat, C .

PHYSICAL REVIEW B, 2000, 62 (10) :6415-6420

[5] Magnetic 4d monoatomic rows on Ag vicinal surfaces -: art. no. 094403 [J].

Bellini, V ;

Papanikolaou, N ;

Zeller, R ;

Dederichs, PH .

PHYSICAL REVIEW B, 2001, 64 (09)

[6]

BIHLMAYER G, 2001, COMMUNICATION

[7] MAGNETISM FROM THE ATOM TO THE BULK IN IRON, COBALT, AND NICKEL CLUSTERS [J].

BILLAS, IML ;

CHATELAIN, A ;

DEHEER, WA .

SCIENCE, 1994, 265 (5179) :1682-1684

[8] Absence of spontaneous magnetic order at nonzero temperature in one- and two-dimensional Heisenberg and XY systems with long-range interactions -: art. no. 137203 [J].

Bruno, P .

PHYSICAL REVIEW LETTERS, 2001, 87 (13)

[9] TIGHT-BINDING APPROACH TO THE ORBITAL MAGNETIC-MOMENT AND MAGNETOCRYSTALLINE ANISOTROPY OF TRANSITION-METAL MONOLAYERS [J].

BRUNO, P .

PHYSICAL REVIEW B, 1989, 39 (01) :865-868

[10]

Caneschi A, 2001, ANGEW CHEM INT EDIT, V40, P1760, DOI 10.1002/1521-3773(20010504)40:9<1760::AID-ANIE17600>3.0.CO

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