Dissipation Force Microscopy
During scanning in
Non-contact mode the changes of the both amplitude and place of cantilever resonant peak are observed. These changes are the results of various kind tip-sample interactions. Different dissipation processes cause changes of amplitude. As example magnetic dissipation is presented.
Magnetic dissipation is caused by cyclic magnetization reversal in the sample induced by tip. This dissipation can be quantified
[1, 2]. Its value strong depends on tip type and scanning parameters. Results of
ac MFM and DM are shown on Example and are obtained simultaneously.
DM is kind of two-pass technique. During the first pass topography of specimen is obtained and during the second pass cantilever is piezodrived at his resonant frequency. It is provided be special feedback circuit. Caused by tip-sample interaction dissipation is appeared as changing in cantilever vibrations amplitude.
Presented in Example measurements were carried out in normal conditions. The stripe domains are seen on both phase and amplitude distributions. Darkest areas on amplitude distributions correspond to maximal damping (minimal amplitude). Predominant position of darkest areas nearly domain walls can be explained by moving of domain walls by the tip
[2]. It must be noted that in our Example only next nearest domain wall is seen, it can be attributed to magnetic tip tilt and specimen peculiarities.
References
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J. Appl. Phys. 81, 5024 (1997).
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Appl. Phys. Lett. 74, 419 (1999).
