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We have characterized a new Magnetic Force Microscopy (MFM) probe based on aniron filled carbon nanotube (FeCNT) using MFM imaging on permalloy (Py) diskssaturated in a high magnetic field perpendicular to the disk plane. Theexperimental data are accurately modeled by describing the FeCNT probe ashaving a single magnetic monopole at its tip whose effective magnetic charge isdetermined by the diameter of the iron wire enclosed in the carbon nanotube andits saturation magnetization 4 \pi M_s ~ 2.2 x 10^4 G. A magnetic monopoleprobe enables quantitative measurements of the magnetic field gradient close tothe sample surface. The lateral resolution is defined by the diameter of theiron wire ~15 nm and the probe-sample separation. As a demonstration, themagnetic field gradients close to the surface of a Py dot in domain and vortexstates were imaged.

Quantitative magnetic force microscopy on permalloy dots using an iron filled carbon nanotube probe