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Related Experiment Video

Updated: Mar 2, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Published on: July 20, 2022

Extensive characterization of magnetic microrods observed using optical microscopy.

Fabien Gerbal¹, Yuan Wang, Olivier Sandre

¹Laboratoire Matière et Systèmes Complexes (MSC) UMR 7057 (CNRS) and Université Denis Diderot - Sorbonne Paris Cité, 10 rue Alice Domon et Léonie Duquet, 75013 Paris, France. fabien.gerbal@upmc.fr.

|May 18, 2017

Summary

Researchers developed a method to measure magnetic properties of micro/nanorods using magnetic tweezers. This technique accurately determines magnetic susceptibility and nanoparticle count in superparamagnetic rods.

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Area of Science:

Materials Science
Nanotechnology
Physics

Background:

Micro/nanorods are increasingly used in research and industry.
Accurate determination of their geometrical, mechanical, and magnetic properties is crucial.

Purpose of the Study:

To present an experimental procedure for characterizing single magnetic rods.
To measure magnetic susceptibility and deduce nanoparticle composition.

Main Methods:

Utilizing an optical microscope with magnetic tweezers for characterization.
Measuring magnetic susceptibility (χ) by analyzing rod deformation under a magnetic field.
Refining a theoretical model to account for field-dependent susceptibility.

Main Results:

Consistent magnetic susceptibility measurements across various field strengths and angles.
Experimental validation of the refined theoretical model.
Deduction of the number of iron oxide nanoparticles within the polymer matrix.

Conclusions:

The developed method provides a comprehensive characterization of magnetic rods.
The technique is reliable for determining magnetic properties and composition.
This advancement supports the broader application of micro/nanorods.