| Full-resonance Spectroscopy |
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Oscillated tip-sample interaction affects not only
on amplitude and phase lag, but also on the resonant frequency f of
cantilever vibration and on the shape of resonance curve (quality
factor Q). Under scanning the changes of the both f and Q are observed.
These changes are the results of various kind tip-sample interactions.
For more complete characterization of these interactions it is useful
to obtain resonant curves (RC) in each point of scan at certain
tip-sample distance (full resonance spectroscopy (FRS): amplitude
(f,x,y), where f is frequency). Then the acquired data can be treated
and different parameters of interaction can be determined.
Changing
of the tip-sample force derivatives under scanning leads to changing of
the resonant frequency. Different dissipation processes cause changes
of the resonance peak shape. As a result to characterise tip-sample
interaction the maximal amplitude, resonance frequency and width at
half maximum (WHM) or quality factor Q of cantilever oscillation can be
determined in each point of scan. This technique can be applied to
study for example magnetic dissipation processes [1,2].
ReferencesCopyright © 1998-2007, NT-MDT. All rights reserved. |
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