Tech Briefs Magazine - May 2022 - 48

Power & Energy
petitive with established thermoelectric
generators for the first time.
So-called Heusler alloys - magnetic
intermetallic compounds - are
applied in the form of thin films in
thermomagnetic generators and provide
for a big temperature-dependent
change of magnetization and quick
heat transfer. This is the basis of the
new concept of resonant self-actuation.
Even at small temperature differences,
resonant vibrations are induced in devices
and can be converted efficiently
into electrical power. Still, electrical
power of single devices is low and upscaling
will depend on material development
and engineering.
The researchers used a nickel-manganese-gallium
alloy and found that alloy
film thickness and the device footprint
influence electrical power in opposite
directions. Based on this finding, they
succeeded in improving electrical power
per footprint by a factor of 3.4 by increasing
the thickness of the alloy film
from 5 to 40 micrometers. The thermomagnetic
generators reached a maximum
electrical power of 50 microwatts
per square centimeter at a temperature
change of just 3 °C.
These results pave the way to the development
of customized thermomagnetic
generators connected in parallel
for potential use of waste heat close to
room temperature.
For more information, contact Martin
The thermomagnetic generators are based on magnetic thin films with highly temperature-dependent
properties. (Photo: IMT/KIT)
Heidelberger at martin.heidelberger@kit.
edu; +49 721 608-41169.
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Webinars
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Good measurements are essential for any test setup whatever that scenario might be. Understanding basic requirements and terms is
imperative to ensure the measurement accuracy and performance of a device under test. This 60-minute Webinar discusses the basics
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Topics include:
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Speaker:
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Rohde & Schwarz
Please visit www.techbriefs.com/webinar277
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Tech Briefs Magazine - May 2022

Table of Contents for the Digital Edition of Tech Briefs Magazine - May 2022

Tech Briefs Magazine - May 2022 - Intro
Tech Briefs Magazine - May 2022 - Sponsor
Tech Briefs Magazine - May 2022 - Cov1
Tech Briefs Magazine - May 2022 - Cov2
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