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Single nanoparticles magnetization curves by controlled tip magnetization magnetic force microscopy.

Livia Angeloni1, Daniele Passeri, Stella Corsetti

  • 1Department of Basic and Applied Sciences for Engineering, SAPIENZA University of Rome, Rome, Italy. daniele.passeri@uniroma1.it.

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|November 14, 2017
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Summary

Controlled Magnetization-Magnetic Force Microscopy (CM-MFM) enables precise measurement of individual magnetic nanoparticle properties. This technique accurately determines magnetization curves, saturation magnetization, and coercivity for nanoparticles, advancing nanomagnetometry.

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Area of Science:

  • Nanomagnetism
  • Materials Science
  • Physics

Background:

  • Accurate characterization of individual magnetic nanoparticles (NPs) is crucial for understanding and tuning their properties.
  • Magnetic Force Microscopy (MFM) offers high lateral resolution but is limited by electrostatic artifacts.
  • Controlled Magnetization-MFM (CM-MFM) has been developed to overcome MFM limitations, enabling quantitative magnetic signal correlation.

Purpose of the Study:

  • To establish an experimental procedure using CM-MFM for measuring magnetization curves of single magnetic NPs.
  • To determine key magnetic parameters: saturation magnetization, magnetic field, and coercivity.
  • To validate the CM-MFM technique for nanomagnetometry.

Main Methods:

  • Utilized Controlled Magnetization-MFM (CM-MFM) for high-resolution magnetic characterization.
  • Applied the technique to individual iron oxide (Fe3O4) nanoparticles (18-32 nm diameter).
  • Measured magnetization curves, including saturation magnetization, magnetic field, and coercivity.

Main Results:

  • Successfully measured magnetization curves for individual Fe3O4 nanoparticles.
  • Obtained quantitative magnetic parameters for single NPs.
  • Results showed excellent agreement with SQUID analysis on bulk samples.

Conclusions:

  • CM-MFM is a powerful technique for quantitative nanomagnetometry of individual magnetic nanoparticles.
  • The proposed experimental procedure enables precise determination of single NP magnetic properties.
  • This method holds significant potential for advancing the field of nanomagnetism.