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Ferromagnetism

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

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Design and engineering colloidal magnetic particles for nanoscale thermometry.

A J Biacchi¹, T Q Bui², C L Dennis³

¹Nanoscale Device Characterization Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA.

International Journal on Magnetic Particle Imaging

|June 14, 2021

Summary

This summary is machine-generated.

Researchers developed new magnetic nanoparticles (MNPs) for precise remote temperature sensing. These engineered MNPs offer enhanced magneto-thermosensitivity for advanced thermometry applications.

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Last Updated: Nov 2, 2025

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Thermal Measurement Techniques in Analytical Microfluidic Devices

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Published on: June 3, 2015

Area of Science:

Nanotechnology and Materials Science
Applied Magnetism and Thermometry

Background:

Magnetic nanoparticle (MNP) thermometry enables remote temperature measurements in volumes inaccessible to conventional methods.
Existing commercial MNPs lack sufficient magneto-thermosensitivity for practical applications, especially near room temperature.

Purpose of the Study:

To engineer novel magnetic nanoparticles (MNPs) for enhanced thermometry applications within the 200 K - 400 K range.
To develop a practical method for high-sensitivity, spatially resolved, 3D temperature measurements using AC magnetometry.

Main Methods:

Synthesis of engineered MNPs using cobalt-doped ferrites via scalable solution chemistry routes.
Tunable synthesis to control MNP size and composition for optimized properties.
Characterization of MNP magneto-thermosensitivity for thermometry applications.

Main Results:

Successfully developed engineered MNPs with improved magneto-thermosensitivity for thermometry.
Demonstrated tunable synthesis for controlled MNP characteristics.
Established the foundation for 3D, high-sensitivity temperature measurement systems.

Conclusions:

Engineered cobalt-doped ferrite MNPs show significant promise for advanced thermometry.
Scalable synthesis routes enable practical development of MNP-based temperature sensing.
These nanothermometers are suitable for high-sensitivity, spatially resolved temperature measurements.