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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: Jun 3, 2025

Fabrication of Surface Acoustic Wave Devices on Lithium Niobate

Fabrication of Surface Acoustic Wave Devices on Lithium Niobate

Published on: June 18, 2020

Magnetoelectric BAW and SAW Devices: A Review.

Bin Luo¹, Prasanth Velvaluri¹, Yisi Liu¹

¹Electrical and Computer Engineering Department, Northeastern University, Boston, MA 02115, USA.

|January 8, 2025

Summary

This summary is machine-generated.

Magnetoelectric devices using acoustic waves offer ultra-sensitive magnetic sensing and compact antennas. These advancements are key for future bio-sensing, wireless communication, and quantum technologies.

Keywords:

antennas bio-sensing bulk acoustic wave (BAW)isolators magnetic field sensors magnetoelectric (ME) devices quantum technology surface acoustic wave (SAW)wireless communication

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Area of Science:

Materials Science
Electrical Engineering
Physics

Background:

Magnetoelectric (ME) devices integrate piezoelectric and magnetostrictive materials.
They are crucial for miniaturizing and improving sensing and communication technologies.

Purpose of the Study:

To review recent advancements in bulk acoustic wave (BAW) and surface acoustic wave (SAW) ME devices.
To highlight their applications in magnetic sensing, antennas, and quantum technologies.

Main Methods:

Utilizing the mechanical resonance of BAW and SAW modes in ME devices.
Investigating hybrid magnetoacoustic waves for non-reciprocal devices.

Main Results:

Achieved femto- to pico-Tesla sensitivity in ME sensors for biomedical applications.
Demonstrated significant size reduction in ME antennas with high radiation gain and efficiency.
Showcased potential for RF isolation and control of quantum defects using ME magnetoacoustic devices.

Conclusions:

ME devices leveraging acoustic waves show great promise for bio-sensing, wireless communication, and quantum information technologies.
Continued material and device structure advancements will further boost ME device performance.