In accordance with a first aspect of the present invention, the sensitivity of a magnetically modulated AC-AFM is substantially improved by the use of a ferrite-core solenoid for modulating the magnetic cantilever of the ACAFM. In accordance with a second aspect of the present invention, the ...http://www.google.de/patents/US5753814?utm_source=gb-gplus-sharePatent US5753814 - Magnetically-oscillated probe microscope for operation in liquids
