title   
  

Noncontact lateral-force gradient measurement on Si(111)-7×7 surface with small-amplitude off-resonance atomic force microscopy

Atabak, Mehrdad and Ünverdi, Özhan and Özer, H. Özgür and Oral, Ahmet (2009) Noncontact lateral-force gradient measurement on Si(111)-7×7 surface with small-amplitude off-resonance atomic force microscopy. Journal of Vacuum Science & Technology B, Microelectronics and Nanometer Structures, 27 (2). pp. 1001-1005. ISSN 1071-1023

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Official URL: http://dx.doi.org/10.1116/1.3097857

Abstract

In this work, the authors report on a quantitative investigation of lateral-force gradient and lateral force between a tungsten tip and Si(111)-(7×7) surface using combined noncontact lateral-force microscopy and scanning tunneling microscopy. Simultaneous lateral-force gradient and scanning tunneling microscopy images of single and multiatomic step are obtained. In our measurement, tunnel current is used as feedback. The lateral-stiffness contrast has been observed to be 2.5 N/m at a single atomic step, in contrast to 13 N/m at a multiatomic step on Si (111) surface. They also carried out a series of lateral stiffness-distance spectroscopy, which show a sharp increase in tip-surface interaction stiffness as the sample is approached toward the surface.

Item Type:Article
Subjects:Q Science > QC Physics
ID Code:11440
Deposited By:Ahmet Oral
Deposited On:08 Apr 2009 10:25
Last Modified:25 May 2011 14:20

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