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Magnetic force microscopy. Tapping mode AFM topography and MFM images of the BNF100 and C50 MNPs. (a, d) AFM topography images of the BNF100 and C50 MNPs, correspondingly. (b, c and e, f) MFM frequency contrast images of the same MNPs with magnetic moment of the tip aligned downward and upward, correspondingly. The magnetic moment alignment of the AFM tip was performed using a permanent magnet placed in proximity before each measurement.
