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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...

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...

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Related Experiment Video

Updated: Jun 5, 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

Data-driven concavity engineering for magnetic activation in rigid microspheres.

Chang Zhang^1,2,3, Longjun Rao^1,2,3, Lishan Wu^1,2,3

¹Laboratory of Advanced Materials, College of Smart Materials and Future Energy, Fudan University, Shanghai, China.

Nature Communications

|June 3, 2026

Summary

This summary is machine-generated.

Researchers developed a novel method using stress manipulation during droplet evaporation to create concave microspheres. This technique enhances magnetic properties, enabling lightweight, high-performance electromagnetic materials.

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Area of Science:

Materials Science
Nanotechnology
Electromagnetism

Background:

Concave architectures amplify interfacial activity and local fields for various applications.
Controllable synthesis of concave structures in rigid metals is difficult due to surface energy and crystallographic constraints.

Purpose of the Study:

To propose a new strategy for inducing and regulating surface concavity in rigid microspheres.
To enhance magnetic activity in electromagnetic systems using engineered concave configurations.

Main Methods:

A broadly applicable stress manipulation strategy during droplet evaporation.
Machine learning optimization to guide the engineered concave configuration.
Synthesis of optimal FeCo alloys.

Main Results:

Achieved enhanced magnetic activity in electromagnetic systems.
Optimal FeCo alloys showed a 28% increase in high-frequency magnetic response.
Demonstrated a 79.5% reduction in density while maintaining high saturation magnetization (236.6 emu/g).

Conclusions:

The stress manipulation strategy successfully decouples magnetism from density.
Enables the design of lightweight, multifunctional magnetic materials.
Offers a new pathway for fabricating advanced concave architectures.