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Ferromagnetism

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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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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Related Experiment Video

Updated: Jul 16, 2026

A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries

A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries

Published on: January 28, 2018

A compact permanent magnet array with a remote homogeneous field.

Andrew E Marble¹, Igor V Mastikhin, Bruce G Colpitts

¹MRI Centre, Department of Physics, P.O. Box 4400, University of New Brunswick, Fredericton, NB, Canada E3B 5A3.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)

|February 24, 2007

Summary

We developed a compact magnet array producing a homogeneous magnetic field with a unique

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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

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Last Updated: Jul 16, 2026

A Paired Bead and Magnet Array for Molding Microwells with Variable Concave Geometries

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Published on: January 28, 2018

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

Area of Science:

Physics
Engineering
Biomedical Imaging

Background:

Homogeneous magnetic fields are crucial for various scientific applications, including magnetic resonance imaging (MRI).
Existing magnet designs often face limitations in terms of size, weight, or field orientation.
The development of specialized magnetic field generators is essential for advancing imaging technologies and improving signal-to-noise ratio (SNR).

Purpose of the Study:

To design and construct a novel single-sided magnet array.
To generate a homogeneous static magnetic field (B(0)) with a localized 'sweet spot'.
To orient the magnetic field parallel to the array surface for enhanced measurement capabilities.

Main Methods:

A compact single-sided magnet array was designed and constructed.
The array's dimensions are 11.5 cm x 10 cm x 6 cm, weighing approximately 5 kg.
The magnetic field properties, including spatial derivatives, were analyzed to identify the 'sweet spot'.

Main Results:

The magnet array successfully generates a homogeneous B(0) field.
A 'sweet spot' with near-zero first and second spatial derivatives was identified 1 cm above the array surface.
The B(0) field is oriented parallel to the array surface, a key design feature.

Conclusions:

The developed magnet array offers a compact and efficient solution for generating a homogeneous magnetic field.
The parallel field orientation enables the use of ordinary surface coils for unilateral measurements.
This design holds significant potential for dramatic improvements in signal-to-noise ratio (SNR) for specific applications.