Magnetics Business & Technology - November/December 2020 - 6

FEATURE ARTICLE

Paragraf Strides toward Commercializing Graphene-Based Hall Effect Sensors for Highly
Precise Magnetic Measurement
In June, Paragraf embarked on a working partnership with the
Magnetic Measurement section at CERN, the European Organization for Nuclear Research, with both parties set to demonstrate how new opportunities for magnetic measurements are
opened up through the unique properties of its graphene sensor,
particularly its negligible planar Hall effect.
"This collaboration with CERN demonstrates the potential of
graphene-based Hall effect sensors to improve accuracy in
magnetic measurement applications. Our Hall effect sensors
address key challenges CERN is facing in mapping magnetic
fields, namely: highly accurate measurements of local field
distributions in accelerator magnets, while eliminating artifacts
and reducing uncertainties stemming from the sensors," said
Thomas.

Wire bonding of a Paragraf Hall Effect sensor to a chip carrier using a
wedge bonder
Bolstered by £16.2 million in investor funding and a new collaboration with CERN, UK-based Paragraf is striding forward
to commercialize its breakthrough graphene Hall Effect sensor
which could be a gateway to next generation magnetic field
sensing. Measured to be 30 times more precise than a silicon
Hall Effect sensor, the company says, it delivers the unique twodimensional properties of graphene for highly precise magnetic
field measurement. Potential applications for sensing and control
include scientific research, healthcare, aerospace, industrial and
automotive markets.

CERN operates the largest particle accelerators in the world, for
example its 27-km long, Large Hadron Collider which straddles
the border between Switzerland and France near Geneva. Physicists look at how our world is built at the fundamental level by
colliding sub-atomic particles in particle accelerators that rely on
large numbers of normal and superconducting magnets to steer
and focus the particle beam to their collision points.
The Magnetic Measurements section at CERN tests magnets
for these accelerators using the latest-available techniques and
instruments. High precision and reliable measurements are
performed for many of their projects, so they are continually
seeking new sensors and transducers for improving methods
and accuracy.

In an interview with Magnetics Magazine in August, Paragraf
CEO, Simon Thomas, gave this account of
what he foresees as the most likely initial
and most compelling commercial applications for the sensors:
"Owing to the highly reliable cryogenic
operation and the large field measurement
range, the GHS is finding many applications in scientific markets. Researchers and
end users working with strong resistive and
superconducting magnets at accelerator facilities like CERN and at other specialist high Simon Thomas, CEO
field and low temperature research institutes of Paragraf
really value this capability," said Thomas.
"The unbeatable resolution and lack of
planar Hall effect is enabling them to undertake measurements
which were not before possible, this capability also permits accurate measurements in the very low field range."
"As a result, manufacturers of equipment supplied into this
market are taking interest in incorporating sensors into their
products, offering end users ready-made solutions. Projecting
forward, we are seeing comparable opportunities to address
needs in the healthcare, aerospace, energy and transport sectors - who value the same capabilities from the GHS, but where
adoption timelines are significantly longer."

6

Magnetics Business & Technology * November/December 2020

Electrical measurements of a Hall Effect sensor on a wafer

Existing Hall effect sensors all exhibit planar Hall effects where
field components which are not perpendicular to the sensing
plane produce false signals. This is because the sensing layer is
effectively three-dimensional, with some amount of depth. These
false signals, together with the non-linear response to the field
strength, increase the measurement uncertainty and thus limit
the application of Hall sensors. Separating the true signals from
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Magnetics Business & Technology - November/December 2020

Table of Contents for the Digital Edition of Magnetics Business & Technology - November/December 2020

Magnetics Business & Technology - November/December 2020
Editor’s Choice/ Features
Paragraf Strides toward Commercializing Graphene- Based Hall Effect Sensors for Highly Precise Magnetic Measurement
Magnetics-Based Turboexpander Enables Energy Recovery from Pressure Letdown Stations in Natural Gas Pipelines
Buildup of Littoral Naval Forces Brings New Attention to Underwater Magnetic Sensing
Tech Tips
Embedding Magnetics Achieves Reliability & Consistency, Part 2 of 3
Product News
Industry News
Events Calendar/ Advertising Index
Visions
Magnetics Business & Technology - November/December 2020 - Magnetics Business & Technology - November/December 2020
Magnetics Business & Technology - November/December 2020 - Cover2
Magnetics Business & Technology - November/December 2020 - 3
Magnetics Business & Technology - November/December 2020 - Editor’s Choice/ Features
Magnetics Business & Technology - November/December 2020 - 5
Magnetics Business & Technology - November/December 2020 - Paragraf Strides toward Commercializing Graphene- Based Hall Effect Sensors for Highly Precise Magnetic Measurement
Magnetics Business & Technology - November/December 2020 - 7
Magnetics Business & Technology - November/December 2020 - Magnetics-Based Turboexpander Enables Energy Recovery from Pressure Letdown Stations in Natural Gas Pipelines
Magnetics Business & Technology - November/December 2020 - 9
Magnetics Business & Technology - November/December 2020 - 10
Magnetics Business & Technology - November/December 2020 - 11
Magnetics Business & Technology - November/December 2020 - 12
Magnetics Business & Technology - November/December 2020 - 13
Magnetics Business & Technology - November/December 2020 - Buildup of Littoral Naval Forces Brings New Attention to Underwater Magnetic Sensing
Magnetics Business & Technology - November/December 2020 - 15
Magnetics Business & Technology - November/December 2020 - Embedding Magnetics Achieves Reliability & Consistency, Part 2 of 3
Magnetics Business & Technology - November/December 2020 - 17
Magnetics Business & Technology - November/December 2020 - 18
Magnetics Business & Technology - November/December 2020 - 19
Magnetics Business & Technology - November/December 2020 - Product News
Magnetics Business & Technology - November/December 2020 - 21
Magnetics Business & Technology - November/December 2020 - 22
Magnetics Business & Technology - November/December 2020 - 23
Magnetics Business & Technology - November/December 2020 - Industry News
Magnetics Business & Technology - November/December 2020 - 25
Magnetics Business & Technology - November/December 2020 - 26
Magnetics Business & Technology - November/December 2020 - 27
Magnetics Business & Technology - November/December 2020 - Events Calendar/ Advertising Index
Magnetics Business & Technology - November/December 2020 - 29
Magnetics Business & Technology - November/December 2020 - Visions
Magnetics Business & Technology - November/December 2020 - Cover3
Magnetics Business & Technology - November/December 2020 - Cover4
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