Reaching the magnetic anisotropy limit of a 3d metal atom

被引：315

作者：

Rau, Ileana G. ^{[1
]}

Baumann, Susanne ^{[1
,2
]}

Rusponi, Stefano ^{[3
]}

Donati, Fabio ^{[3
]}

Stepanow, Sebastian ^{[4
]}

Gragnaniello, Luca ^{[3
]}

Dreiser, Jan ^{[3
,5
]}

Piamonteze, Cinthia ^{[5
]}

Nolting, Frithjof ^{[5
]}

Gangopadhyay, Shruba ^{[1
]}

Albertini, Oliver R. ^{[1
,6
]}

Macfarlane, Roger M. ^{[1
]}

Lutz, Christopher P. ^{[1
]}

Jones, Barbara A. ^{[1
]}

Gambardella, Pietro ^{[4
]}

Heinrich, Andreas J. ^{[1
]}

Brune, Harald ^{[3
]}

机构：

[1] IBM Almaden Res Ctr, San Jose, CA 95120 USA

[2] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

[3] Ecole Polytech Fed Lausanne, Inst Condensed Matter Phys, Stn 3, CH-1015 Lausanne, Switzerland

[4] ETH, Dept Mat, CH-8093 Zurich, Switzerland

[5] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[6] Georgetown Univ, Dept Phys, Washington, DC 20057 USA

来源：

SCIENCE | 2014年 / 344卷 / 6187期

基金：

美国国家科学基金会; 瑞士国家科学基金会;

关键词：

RAY CIRCULAR-DICHROISM; PERPENDICULAR-ANISOTROPY; SPECTROSCOPY; ABSORPTION; RESOLUTION; SURFACE; MOMENT;

D O I：

10.1126/science.1252841

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Designing systems with large magnetic anisotropy is critical to realize nanoscopic magnets. Thus far, the magnetic anisotropy energy per atom in single-molecule magnets and ferromagnetic films remains typically one to two orders of magnitude below the theoretical limit imposed by the atomic spin-orbit interaction. We realized the maximum magnetic anisotropy for a 3d transition metal atom by coordinating a single Co atom to the O site of an MgO(100) surface. Scanning tunneling spectroscopy reveals a record-high zero-field splitting of 58 millielectron volts as well as slow relaxation of the Co atom's magnetization. This striking behavior originates from the dominating axial ligand field at the O adsorption site, which leads to out-of-plane uniaxial anisotropy while preserving the gas-phase orbital moment of Co, as observed with x-ray magnetic circular dichroism.

引用

页码：988 / 992

页数：5

共 46 条

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