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Magnetic Damping

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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.
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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

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.