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2 article(s) from Beyer, Hannes

Length-extension resonator as a force sensor for high-resolution frequency-modulation atomic force microscopy in air

Hannes Beyer,
Tino Wagner and
Andreas Stemmer

Beilstein J. Nanotechnol. 2016, 7, 432–438, doi:10.3762/bjnano.7.38

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Figure 1: Experimental setup. a) Feedback scheme. The dashed parts enable the slow-drift compensation. Also s...

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Figure 2: a) Evolution of resonance frequency shift (black), excitation (red), and dew point (blue) over a du...

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Figure 3: Application of the slow feedback control. a) Evolution of frequency shift Δf (black), frequency shi...

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Figure 4: Smoothed frequency-shift (black) versus distance curve on HOPG and tip–sample force F_ts (red) calcu...

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Figure 5: Topography (a) of HOPG after rinsing with Milli-Q water and height profiles (b) along the lines ind...

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Figure 6: High-resolution detuning image of HOPG in quasi-constant height mode. Inset: 3-fold symmetrised dri...

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Full Research Paper

Published 15 Mar 2016

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Kelvin probe force microscopy for local characterisation of active nanoelectronic devices

Tino Wagner,
Hannes Beyer,
Patrick Reissner,
Philipp Mensch,
Heike Riel,
Bernd Gotsmann and
Andreas Stemmer

Beilstein J. Nanotechnol. 2015, 6, 2193–2206, doi:10.3762/bjnano.6.225

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Figure 1: Contributions of apex, cone, and cantilever to the first (AM, left) and second (FM, right) order ca...

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Figure 2: a) Sideband amplitude (blue) and phase (red) relative to the carrier oscillation measured during a ...

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Figure 3: In-phase (red) and quadrature (blue) sideband amplitudes, normalised to the carrier oscillation amp...

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Figure 4: Modulation indices of the sidebands at ω_m (a) and 2ω_m (b) against [Graphic 33] for different modulation amplitu...

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Figure 5: Block diagram of a Kelvin controller based on a) a proportional–integral–differential (PID) control...

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Figure 6: Closed-loop response of the Kelvin observer (black) and a proportional-integral controller (red) to...

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Figure 7: Normalised closed-loop bandwidth (−3 dB) of the steady-state Kelvin observer as a function of the n...

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Figure 8: Schematic of the modified KFM setup. For topography feedback, the cantilever is excited at a consta...

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Figure 9: a) Topography, b) tip–sample capacitance gradient, C'', and c) local contact potential difference, U...

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Figure 10: a), b) Kelvin and c), d) error signal of an InAs nanowire similar to the device shown in Figure 9, measured...

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Figure 11: One-dimensional power spectral densities of the error signals in Figure 10c,d. Integral feedback works well a...

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Full Research Paper

Published 23 Nov 2015

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