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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: Mar 31, 2026

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

Published on: May 9, 2021

Holographic acoustic elements for manipulation of levitated objects.

Asier Marzo^1,2, Sue Ann Seah³, Bruce W Drinkwater⁴

¹Deparment of Mathematics and Computer Engineering, Public University of Navarre, Campus Arrosadia, 31006 Pamplona, Spain.

Nature Communications

|October 28, 2015

Summary

Acoustic levitation now allows precise manipulation of objects using single-sided ultrasonic arrays. This breakthrough enables containerless transport and targeted applications like drug delivery without physical contact.

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Area of Science:

Physics
Acoustics
Biotechnology

Background:

Acoustic levitation can manipulate diverse objects in various media without contact.
Existing methods often require enclosed systems or offer limited maneuverability.

Purpose of the Study:

To develop a single-sided acoustic levitation system for enhanced particle manipulation.
To introduce a novel framework for generating acoustic traps and bridging optical and acoustic trapping.

Main Methods:

Optimizing phase control in ultrasonic phased arrays.
Implementing a holographic acoustic elements framework.
Designing acoustic structures like tweezers, twisters, and bottles.

Main Results:

Demonstrated acoustic levitation with translation, rotation, and manipulation using a single-sided emitter.
Successfully generated versatile acoustic traps via the holographic framework.
Identified optimal acoustic structures for tractor beams and containerless transport.

Conclusions:

Single-beam acoustic levitation offers advanced control for manipulating particles.
This technology has potential applications in targeted drug delivery and non-invasive medical devices.