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Precise force curve detection system with a cantilever controlled by magnetic force feedback
We present the development of an atomic force microscope (AFM) with an externally controllable force using an electromagnet. The position of the AFM cantilever with magnetic material at the end of the backside is controlled directly by the external magnetic field of an electromagnet. It is possible...
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Published in: | Review of scientific instruments 1997-11, Vol.68 (11), p.4132-4136 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | We present the development of an atomic force microscope (AFM) with an externally controllable force using an electromagnet. The position of the AFM cantilever with magnetic material at the end of the backside is controlled directly by the external magnetic field of an electromagnet. It is possible to use an optical detection system because the electromagnet is located inside the piezo tube on which the sample is mounted. A magnetic force feedback system has been implemented in this AFM. The effective stiffness of the cantilever is increased by the open loop gain of the feedback. We are able to control the motion of a soft cantilever (0.16 N/m) with this feedback system in air. Force feedback using an electromagnet allows the elimination of “snap-in” contact which may physically damage the tip and mica sample. |
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ISSN: | 0034-6748 1089-7623 |
DOI: | 10.1063/1.1148357 |