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Updated: Sep 30, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
Published on: July 20, 2022
Determination of core and shell radii of individual core-shell magnetic nanoparticles by magnetic force microscopy
Livia Angeloni1, Luca Buccini1, Pierfrancesco Atanasio1
1Department of Basic and Applied Sciences for Engineering, Sapienza University of Rome Rome Italy daniele.passeri@uniroma1.it.
Abstract:
The characterization of the thickness of a nonmagnetic coating is a primary issue in the investigation of core-shell magnetic nanoparticles (NPs). Here, a method based on magnetic force microscopy (MFM) is reported in which curves of the magnetic phase shift as a function of the lift height are acquired on selected NPs, corrected for electrostatic artifacts, and analyzed using a two-dipole model to describe the tip-sample magnetic interaction. After calibration of the tip on uncoated magnetic NPs, the thickness of the coating of core-shell NPs is determined. The method is demonstrated on core-shell NPs with a magnetite core and silica shell, highlighting its potential and limitations.
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