Dynamic force microscopy of copper surfaces:: Atomic resolution and distance dependence of tip-sample interaction and tunneling current

被引：92

作者：

Loppacher, C ^{[1
]}

Bammerlin, M ^{[1
]}

Guggisberg, M ^{[1
]}

Schär, S ^{[1
]}

Bennewitz, R ^{[1
]}

Baratoff, A ^{[1
]}

Meyer, E ^{[1
]}

Güntherodt, HJ ^{[1
]}

机构：

[1] Univ Basel, Inst Phys, CH-4056 Basel, Switzerland

来源：

PHYSICAL REVIEW B | 2000年 / 62卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.62.16944

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Atomic resolution images of Cu(lll) and Cu(100) surfaces obtained in ultrahigh vacuum with a combined scanning tunneling (STM)/atomic force microscope (AFM) are presented. Scan lines recorded in the noncontact AFM mode and the constant current mode show enhanced corrugation similar to STM experiments. Frequency shift versus distance curves are analyzed to determine the forces between probing tip and sample using the force separation method. The short-range chemical forces are in good agreement with an exponential law. The decay lengths of these chemical forces are found to be twice as large as the decay length of the tunneling current, as predicted by a simple theoretical model. However, both lengths are significantly larger than expected for metallic adhesive interactions.

引用

页码：16944 / 16949

页数：6

共 30 条

[1] Dynamic SFM with true atomic resolution on alkali halide surfaces [J].