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tannedsam2004 posted on Wed, Jan 11 2012 5:16 AM



Can someone please tell me why phase contrast MFM, leads to a change in phase, rather than amplitude. It seems like an obvious question but I can`t seem to find an answer in the literature.



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Suggested by Bede Pittenger

The magnetic force gradient leads to a resonant frequency shift of the cantilever.  The phase shift related to the resonance follows this shift. 

Since we are driving at a constant frequency, a change in both phase and amplitude will be observed in the lock-in outputs, but phase is more popular since the contrast can be higher without big changes in signal level.  I like the book by Sarid for this sort of theory question.  It is old, but covers many interesting SPM cases.


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