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Magnetic Fields

Magnetic Fields

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.
A magnetic field is defined by the force that a charged particle experiences...

Magnetostatic Boundary Conditions

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...

Magnetic Damping

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

Potential Due to a Magnetized Object

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...

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Related Experiment Video

Updated: Feb 26, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

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Published on: September 25, 2020

Wave manipulation with magnetically tunable metasurfaces.

Hujiang Yang¹, Tianlin Yu¹, Qingmin Wang¹

¹State Key Laboratory of Information Photonics and Optical Communications and School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, China.

Scientific Reports

|July 16, 2017

Summary

This summary is machine-generated.

This study introduces a novel magnetically tunable metasurface using ferrite rods. Applying a magnetic field allows for dynamic control over wave propagation and deflection angles, offering new design possibilities.

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Area of Science:

Physics
Materials Science
Electromagnetics

Background:

Metasurfaces offer advanced control over wave propagation.
Existing tunable metasurfaces primarily rely on electrical tuning mechanisms.
There is a need for alternative tuning methods for metasurfaces.

Purpose of the Study:

To demonstrate a magnetically tunable metasurface.
To investigate the influence of magnetic fields on wave manipulation.
To explore the design of tunable metasurfaces using ferrite components.

Main Methods:

Fabrication of a metasurface using ferrite rods and metallic foils.
Tuning the thickness gradient of ferrite rods.
Applying an external magnetic field to the metasurface.
Measuring the deflection angle of transmitted waves.

Main Results:

Demonstrated extraordinary transmission through the metasurface.
Showcased magnetic tunability of wave deflection angles.
Established a correlation between magnetic field strength and deflection angle.
Confirmed the influence of rod thickness gradient on wave propagation.

Conclusions:

A magnetically tunable metasurface was successfully designed and demonstrated.
The applied magnetic field provides dynamic control over wave deflection.
This work presents a new pathway for developing advanced tunable metasurface devices.