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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.5K
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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Related Experiment Video

Updated: Sep 11, 2025

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Synthetic Antiferromagnetic Designer Nanodisks for High-Performance Magnetic Separation.

Subas Scheibler1,2,3, Sebastian Habermann1,2,4,5, Alexander Gogos1,2,4,5

  • 1Nanoparticle Systems Engineering Laboratory, Institute of Energy and Process Engineering (IEPE), Department of Mechanical and Process Engineering (D-MAVT), ETH Zurich, Sonneggstrasse 3, Zurich, 8092, Switzerland.

Advanced Healthcare Materials
|August 11, 2025
PubMed
Summary
This summary is machine-generated.

New synthetic antiferromagnet magnetic disk particles (SAF MDPs) offer superior colloidal stability and rapid, efficient separation (>99%) from fluids. This breakthrough enables high-throughput target capturing for clinical and industrial applications.

Keywords:
disk‐shapedmagnetic capturingsynthetic antiferromagnetic particlesthin magnetic films

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Magnetic separation is crucial for rapid, selective target isolation.
  • Conventional nanoparticles lack colloidal stability and efficient magnetic recovery.
  • Synthetic antiferromagnet (SAF) layered architectures offer tunable magnetic properties.

Purpose of the Study:

  • To develop SAF magnetic disk particles (SAF MDPs) with enhanced stability and magnetic recovery.
  • To optimize SAF MDP design using micromagnetic modeling and scalable manufacturing.
  • To evaluate the separation efficiency of SAF MDPs compared to iron oxide beads.

Main Methods:

  • Micromagnetic modeling for design optimization.
  • Scalable manufacturing of metallic CoSm-based, metal oxide-capped SAF MDPs.
  • Evaluation of colloidal stability, cytocompatibility, and separation efficiency in flowing fluids.

Main Results:

  • SAF MDPs exhibit high chemical and colloidal stability and cytocompatibility.
  • Over 99% separation efficiency achieved for SAF MDPs from flowing fluids (1 mL/min).
  • SAF MDPs significantly outperform conventional iron oxide beads (60% recovery).

Conclusions:

  • SAF MDPs overcome limitations of conventional magnetic nanoparticles.
  • The developed SAF MDPs enable quantitative capturing and enrichment in high-throughput settings.
  • This technology is suitable for clinical and industrial applications requiring efficient magnetic separation.