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Simulation and AFM-MFM results. (a) 3D AFM scan of 30 nm Ni NSMT. (b) A 7 × 7 μm scan of the 30 nm NSMT. (c) Height profile of the A-B line from figure (b). (d) Simulated magnetic field gradient in the z direction. (e) Calculated magnetic field gradient variation with distance between NSMT and with size of NSMT. (f) AFM measurements and corresponding MFM results for NSMT fabricated using 30 nm Ni film.
