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Related Concept Videos

Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
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...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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...
Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
Diamagnetism01:26

Diamagnetism

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.
Other Unique Bacteria01:18

Other Unique Bacteria

Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...

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Related Experiment Video

Updated: May 20, 2026

Measurement Of Neuromagnetic Brain Function In Pre-school Children With Custom Sized MEG
14:15

Measurement Of Neuromagnetic Brain Function In Pre-school Children With Custom Sized MEG

Published on: February 19, 2010

Smaller magnets for smarter minds?

Neil Muggleton1, Vincent Walsh

  • 1Institute of Cognitive Neuroscience, National Central University, Jhongli 320, Taiwan. n.muggleton@ucl.ac.uk

Trends in Cognitive Sciences
|July 31, 2012
PubMed
Summary

New microscopic magnetic stimulation devices offer a potential solution to the limitations of current human brain stimulation therapies. This advancement could overcome challenges associated with electrical stimulation methods.

Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Medical Devices

Background:

  • Current human brain stimulation techniques face significant short- and long-term limitations.
  • Electrical stimulation devices are commonly used but present challenges.
  • There is a need for alternative, less invasive, or more effective brain stimulation methods.

Purpose of the Study:

  • To explore the potential of magnetic stimulation devices as an alternative to electrical brain stimulation.
  • To address the limitations of existing therapeutic brain stimulation technologies.
  • To introduce a novel microscopic magnetic stimulation device.

Main Methods:

  • Development of a new microscopic magnetic stimulation device.
  • Exploration of magnetic principles for neural modulation.

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
09:54

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

Related Experiment Videos

Last Updated: May 20, 2026

Measurement Of Neuromagnetic Brain Function In Pre-school Children With Custom Sized MEG
14:15

Measurement Of Neuromagnetic Brain Function In Pre-school Children With Custom Sized MEG

Published on: February 19, 2010

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
09:54

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

  • Conceptualization of implantable magnetic stimulation systems.

    • Main Results:

    • The development of a microscopic magnetic stimulation device has been achieved.
    • This technology offers a potential pathway to overcome current stimulation limitations.
    • The device represents a step towards realizing implantable magnetic stimulation.

    Conclusions:

    • Microscopic magnetic stimulation devices show promise for overcoming limitations in therapeutic brain stimulation.
    • Implantable magnetic devices could offer a viable alternative to electrical stimulation.
    • Further development of this technology is warranted for clinical applications.