Quantum size effects of small, size-selected and deposited CoRh clusters on Ni

被引：4

作者：

Beeck, T. ^{[1
]}

Baev, I. ^{[1
]}

Chen, K. ^{[2
]}

Palutke, S. ^{[1
]}

Wurth, W. ^{[3
,4
,5
]}

Martins, M. ^{[1
]}

机构：

[1] Univ Hamburg, Dept Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany

[2] Univ Cologne, Inst Phys 2, Zulpicher Str 77, D-50937 Cologne, Germany

[3] Univ Hamburg, Dept Phys, Luruper Chaussee 149, D-22761 Hamburg, Germany

[4] Univ Hamburg, Ctr Free Electron Laser Sci, Luruper Chaussee 149, D-22761 Hamburg, Germany

[5] DESY Photon Sci, Notkestr 85, D-22607 Hamburg, Germany

来源：

NEW JOURNAL OF PHYSICS | 2016年 / 18卷

关键词：

XAS; XMCD; deposited clusters; nanoscale magnetism; chemical reactivity; MAGNETIC-CIRCULAR-DICHROISM; NANOALLOY CLUSTERS; ULTRATHIN FILMS; COBALT; NANOPARTICLES; ALLOYS; RH;

D O I：

10.1088/1367-2630/18/11/113007

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electronic, chemical and magnetic properties of in situ prepared, mass-selected and deposited CoxRhy alloy clusters with up to five atoms per cluster have been studied by means of x-ray absorption and x-ray magnetic circular dichroism spectroscopy. The clusters were supported on a remanently magnetized Ni film. The cluster properties exhibit strong size and composition dependent effects. By alloying of pure Co-1,Co-2 adatoms and dimers with Rh the chemical reactivity towards oxygen is significantly enhanced for specific compositions. The oxidation of the alloyed clusters strongly affects the magnetic properties which results in a reduction of the orbital and spin magnetic moments. The exchange coupling between the oxidized Co atoms and the Ni surface exhibits a size and a composition dependent oscillation between antiferromagnetic and ferromagnetic coupling.

引用

页数：8

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