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Ferromagnetism01:31

Ferromagnetism

2.9K
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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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Paramagnetism01:30

Paramagnetism

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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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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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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.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Superferromagnetic Disk Particles for Magnetic Particle Imaging.

Erik M Mayr1,2,3,4,5, Justin Ackers6, Alexander Gogos4

  • 1Nanoparticle Systems Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092, Zurich, Switzerland.

Small Methods
|November 24, 2025
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Summary
This summary is machine-generated.

New superferromagnetic (SF) disk nanoparticles significantly enhance magnetic particle imaging (MPI) performance. These advanced tracers offer improved spatial resolution and sensitivity, paving the way for clinical MPI applications.

Keywords:
magnetic disk particlesmagnetic nanoparticlesmagnetic particle imagingsuper ferromagnetism

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Nanotechnology

Background:

  • Magnetic Particle Imaging (MPI) enables sensitive, radiation-free imaging but is limited by current superparamagnetic (SP) tracer performance.
  • Clinical translation of MPI is hindered by the suboptimal resolution and sensitivity of existing tracers.

Purpose of the Study:

  • To develop and evaluate novel superferromagnetic (SF) disk-shaped nanoparticles as advanced tracers for Magnetic Particle Imaging (MPI).
  • To improve spatial resolution and sensitivity in MPI through engineered nanoparticle design.

Main Methods:

  • Fabrication of disk-shaped nanoparticles from superferromagnetic (SF) discontinuous metal-insulator multilayers (DMIMs).
  • Characterization of nanoparticle magnetic properties, including high susceptibility and sharp magnetization switching below 1 mT.
  • Evaluation of nanoparticle performance in MPI experiments, comparing them to established Perimag tracers.

Main Results:

  • Engineered disk particles (MDPs) exhibited robust SF behavior due to inter-island exchange interactions.
  • MDPs demonstrated up to a 1.6-fold improvement in spatial resolution and a 2.4-fold increase in sensitivity compared to Perimag.
  • Superior imaging characteristics of MDPs were confirmed in complex geometries via system matrix measurements and hybrid reconstructions.

Conclusions:

  • SF DMIM disks represent a promising next-generation tracer platform for MPI.
  • These advanced tracers have the potential to simplify MPI scanner designs.
  • The findings pave the way for the clinical translation of MPI technology.