Temperature evolution of nanostructures induced by Ar+ sputtering on Ag(001)

被引：47

作者：

Costantini, G ^{[1
]}

Rusponi, S ^{[1
]}

Gianotti, R ^{[1
]}

Boragno, C ^{[1
]}

Valbusa, U ^{[1
]}

机构：

[1] INFM, Dipartimento Fis, Unita Genova, CNR,CFSBT, I-16146 Genoa, Italy

来源：

SURFACE SCIENCE | 1998年 / 416卷 / 1-2期

关键词：

Ag(001); ion bombardment; scanning tunneling microscopy; surface morphology;

D O I：

10.1016/S0039-6028(98)00589-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

An STM study of the morphologies generated by 1 keV Ar+ sputtering in the 180-500 K temperature range is presented. It is shown that the sputtering temperature, T-s, can be used to lune the final surface structure. At low temperatures, the surface is characterized by a random distribution of vacancy islands. When T-s is increased, square-shaped vacancy islands with straight edges oriented along the principal crystallographic directions are observed. Depth, periodicity and dimension grow as a function of the substrate temperature until, for T-s greater than or equal to 440 K, an almost Aat surface, resulting from a layer-by-layer removal, appears. A simple model, based on the microscopic surface diffusion processes, is also presented in which the importance of vacancy mobility is strongly stressed. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

引用

页码：245 / 254

页数：10

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