Simultaneous current, force and dissipation measurements on the Si(111) 7x7 surface with an optimized qPlus AFM/STM technique

0389163 - FZÚ 2013 RIV DE eng J - Journal Article
Majzik, Zsolt - Setvín, Martin - Bettac, A. - Feltz, A. - Cháb, Vladimír - Jelínek, Pavel
Simultaneous current, force and dissipation measurements on the Si(111) 7x7 surface with an optimized qPlus AFM/STM technique.
Beilstein Journal of Nanotechnology. Roč. 3, March (2012), s. 249-259. ISSN 2190-4286. E-ISSN 2190-4286
R&D Projects: GA ČR GD202/09/H041; GA ČR GAP204/10/0952; GA AV ČR IAA100100905; GA MŠMT(CZ) ME10076
Institutional research plan: CEZ:AV0Z10100521
Keywords : AFM * STM * cross-talk * specific-site force spectroscopy * atomic resolution
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.374, year: 2012

We present the results of simultaneous scanning-tunneling and frequency-modulated dynamic atomic force microscopy measurements with a qPlus setup. The qPlus sensor is a purely electrical sensor based on a quartz tuning fork. If both the tunneling current and the force signal are to be measured at the tip, a cross-talk of the tunneling current with the force signal can easily occur. The origin and general features of the capacitive cross-talk will be discussed in detail in this contribution. Furthermore, we describe an experimental setup that improves the level of decoupling between the tunneling-current and the deflection signal. The efficiency of this experimental setup is demonstrated through topography and site-specific force/tunneling-spectroscopy measurements on the Si(111) 7x7 surface. The results show an excellent agreement with previously reported data measured by optical interferometric deflection.
Permanent Link: http://hdl.handle.net/11104/0218060