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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...

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Related Experiment Video

Updated: Jan 3, 2026

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

Published on: September 4, 2015

Shaping and transporting diamagnetic sessile drops.

Jennifer Dodoo¹, Adam A Stokes¹

¹School of Engineering, Institute for Integrated Micro and Nano Systems, The University of Edinburgh, Edinburgh EH9 3LJ, United Kingdom.

Biomicrofluidics

|November 19, 2019

Summary

This summary is machine-generated.

Diamagnetic fluid drops can be shaped and transported using magnetostatic fields in microfluidics. This research explores diamagnetism as a novel tool for digital microfluidics applications.

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Area of Science:

Physics
Engineering
Materials Science

Background:

Electromagnetic fields are widely used for fluid control in microfluidics and digital microfluidics.
Magnetic control methods for fluids are less explored than electric methods, particularly concerning liquid diamagnetism.

Purpose of the Study:

To investigate the shaping and transport of diamagnetic drops using magnetostatic fields.
To highlight the potential of diamagnetic fluids as a novel tool in microfluidics and digital microfluidics.

Main Methods:

Utilized magnetostatic fields to manipulate diamagnetic fluid drops.
Quantified the magnetic Bond number to assess the magnetic interaction strength with diamagnetic drops.

Main Results:

The magnetic Bond number for diamagnetic drops is significantly smaller than for paramagnetic drops, indicating a weaker magnetic interaction.
Demonstrated the feasibility of shaping and transporting diamagnetic drops with magnetic fields.

Conclusions:

Diamagnetic fluids offer a new avenue for magnetic manipulation in microfluidic systems.
The weaker magnetic interaction of diamagnetic fluids, previously overlooked, can be harnessed for digital microfluidics.