Monopolelike probes for quantitative magnetic force microscopy:   calibration and application
  A local magnetization measurement was performed with a Magnetic Force Microscope (MFM) to determine magnetization in domains of an exchange coupled [Co/Pt]/Co/Ru multilayer with predominant perpendicular anisotropy. The quantitative MFM measurements were conducted with an iron filled carbon nanotube tip, which is shown to behave like a monopole. As a result we determined an additional in-plane magnetization component of the multilayer, which is explained by estimating the effective permeability of the sample within the \mu*-method. 
S. Vock, F. Wolny, T. M\"uhl, R. Kaltofen, L. Schultz, B. B\"uchner,   C. Hassel, L. Lindner, V. Neu
cond-mat.mtrl-sci cond-mat.mes-hall cond-mat.other