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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.
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Related Experiment Video

Updated: Feb 1, 2026

Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

Published on: December 11, 2013

Efficient metallic nanowire welding using the Eddy current method.

Ji Soo Oh¹, Jong Sik Oh¹, Tae Hyung Kim¹

¹School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea.

|December 8, 2018

Summary

A new inductive power transfer method welds metallic nanowires (M-NWs) like silver and copper at junctions. This technique significantly reduces sheet resistance and improves durability on flexible substrates without affecting optical transparency.

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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

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A Fabrication Method for Highly Stretchable Conductors with Silver Nanowires

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Published on: January 21, 2016

Area of Science:

Materials Science
Nanotechnology
Electrical Engineering

Background:

Metallic nanowires (M-NWs) are crucial for flexible electronics.
Efficient junction welding is vital for M-NW network performance.
Existing welding methods face limitations in speed, cost, and substrate compatibility.

Purpose of the Study:

To develop a novel, efficient, and cost-effective method for welding M-NWs.
To investigate the impact of the welding process on electrical and mechanical properties.
To demonstrate the applicability of the method on flexible substrates.

Main Methods:

Utilized indirect Eddy current through inductive power transfer (45 kHz AC).
Applied inductive power for 6 seconds to M-NW networks on polymer substrates.
Characterized sheet resistance, optical transmittance, and surface roughness before and after welding.

Main Results:

Achieved significant sheet resistance reduction: ~67.9% for AgNWs and ~49.9% for CuNWs.
Maintained optical transmittance post-welding.
Reduced surface roughness of AgNW junctions to near single-layer height.
Demonstrated excellent resistance stability (~ΔR/R0) after 10,000 bending cycles for AgNWs on flexible substrates.
Confirmed strong adhesion of welded AgNWs to the substrate.

Conclusions:

The novel inductive power transfer welding method is effective for M-NWs.
The process enhances electrical conductivity and mechanical stability of M-NW networks.
This technique offers a scalable, low-cost solution for flexible electronics fabrication.