Paragraf™ leverages its expertise in the manufacturing and implementation of graphene technology to make another major advancement in Hall sensor performance. The company announced the launch of a new sensor series, which has unparalleled sensitivity and linearity when placed in a low temperature environment and a strong magnetic field.

The GHS-C sensor was tested in the High Field Magnetic Laboratory (HFML) of the Radboud University of Nijmegen and supports operation in magnetic fields up to 30 T and low temperatures (as low as 1.5 K). These sensors provide accuracy previously unachievable under these conditions, maintaining a non-linear error of significantly less than 1% over the entire measurement range.

The GHS-C device's transformative magnetic field measurement capabilities are due to the graphene sensor element. Graphene's inherent high electron mobility directly translates into high sensitivity capability, maintaining this capability over the entire magnetic field-making the calibration of these devices easier.

The two-dimensional nature of graphene also means that the GHS-C sensor provides high-quality, repeatable and accurate data, without hysteresis and immunity to in-plane stray fields. This is a step beyond the traditional Hall sensor, which has shown asymmetry and can produce different measurement results according to the field direction.

Another advantage of the GHS-C series is that their operating power is very low.

Examples of suitable applications include low-temperature quantum computing, high-field magnet monitoring in next-generation MRI systems, fusion energy field control, particle accelerators, and other scientific and medical instruments. These sensors can also be used directly in basic physics experiments, such as quantum physics research, superconductivity and spintronics.

"Under low temperatures and extremely high magnetic fields, the sensitivity performance of other high-end Hall sensors drops dramatically. This is due to the interaction between the different layers of the sensor element. This can cause linearity problems that limit their range and make them difficult to calibrate. Therefore, the best accuracy that these sensors can achieve is significantly limited around 16 T," said Simon Thomas, CEO of Paragraf. "By relying on 2D graphene sensor elements, we can completely circumvent this problem. This means that there is no interaction that affects performance and linearity, and a symmetrical output without hysteresis can be derived. We thank the HFML team for helping us prove the sensor's super High magnetic field capability."

Paragraf and HFML will hold a joint webinar on December 1 to share and discuss test results.

Image: On the right, the 37 T magnet used to test the GHS-C, with a cryostat and variable temperature inserted, as well as measurement electronics and gas treatment system (left)

Paragraf, spun off from the Department of Materials Science at the University of Cambridge, has a core focus...providing the speculative capabilities of graphene to the real world.

Cambridge Network Limited is a company registered in the United Kingdom with the company number 3400152 The Hauser Forum, 3 Charles Babbage Road, Cambridge, CB3 0GT

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