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Related Concept Videos

Ferromagnetism01:31

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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Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.

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Related Experiment Video

Updated: Jun 22, 2026

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
08:52

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

Published on: April 30, 2018

Magnetic nanoparticle temperature estimation.

John B Weaver1, Adam M Rauwerdink, Eric W Hansen

  • 1Department of Radiology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire 03756, USA. john.b.weaver@darthmouth.edu

Medical Physics
|June 24, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method to measure magnetic nanoparticle temperature, enabling in vivo temperature mapping for targeted therapies. The technique accurately estimates temperature using harmonic ratios, independent of nanoparticle properties.

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Medical Physics

Background:

  • Minimally invasive therapies require precise tissue heating for efficacy.
  • Physiological cooling, mainly blood flow, complicates accurate temperature prediction.
  • In vivo temperature monitoring is crucial for effective thermal treatments.

Purpose of the Study:

  • To develop a method for measuring magnetic nanoparticle temperature.
  • To enable in vivo temperature mapping for therapeutic applications.
  • To overcome challenges in predicting temperatures due to physiological cooling.

Main Methods:

  • Utilizing the ratio of the fifth and third harmonics of magnetization from magnetic nanoparticles in a sinusoidal field.
  • Generating a calibration curve by varying the sinusoidal field amplitude.
  • Estimating temperature based on the measured harmonic ratio.

Main Results:

  • Achieved an accuracy of 0.3 Kelvin between 20 and 50 degrees Celsius.
  • Demonstrated method independence from nanoparticle concentration and size distribution.
  • Measurements require only half a second with the current apparatus.

Conclusions:

  • The presented method offers a reliable approach for magnetic nanoparticle thermometry.
  • This technique is adaptable for creating in vivo temperature maps.
  • It holds potential for improving the precision and outcomes of thermal therapies.