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Correlation between tip-apex shape and surface modification by scanning tunneling microscopy

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3 Author(s)
Heike, Seiji ; Advanced Research Laboratory, Hitachi, Ltd., 2520 Akanuma, Hatoyama, Saitama 350-0395, JapanCREST, Japan Science and Technology Corporation (JST), 2520 Akanuma, Hatoyama, Saitama 350-0395, Japan ; Wada, Y. ; Hashizume, Tomihiro

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The correlation between the shape of a probe tip apex for scanning tunneling microscopy and the surface modification patterns on a Si(111)-7×7 surface is demonstrated by using an in situ tip evaluation technique. The tip apex is inversely imaged by using a very sharp nanoneedle fabricated on the sample surface by applying a high voltage between the tip and the surface. When a large current of 100–300 nA flows between the tip and the surface, silicon atoms on the surface are extracted and a trench pattern is formed. The trench pattern agrees well with the geometry of the tip apex. The correlation between the tip shape and the fabrication pattern is discussed in terms of the electric field under the tip. © 1999 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:86 ,  Issue: 8 )

Date of Publication:

Oct 1999

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