“Plastic Paint” Magnetic Field Sensor Based on Spintronics Takes Aim at Consumer Electronics

Inexpensive magnetic-field sensor built from organic thin-film materials never needs calibration

2 min read
“Plastic Paint” Magnetic Field Sensor Based on Spintronics Takes Aim at Consumer Electronics

 

Ever since researchers discovered that magnetic field sensors could be produced on organic thin-film materials, there has been the hope the discovery would lead to inexpensive sensors on flexible substrates. If you could get it right, there was huge potential simply due to the ubiquity of magnetic field sensors in consumer electronics.

There were just a couple of rather large problems. A very narrow magnetic field range limited these sensors usefulness and they required continuous calibration to compensate for changes in temperature and the degradation of the material.

Now researchers at the University of Utah have developed a “spintronic” organic thin-film semiconductor that serves as an inexpensive magnetic field sensor capable of detecting intermediate to strong magnetic fields and never needs to be calibrated.

The magnetic sensing film, which is described in the June 12th edition of the journal Nature Communications,  also resists heat and degradation and operates at room temperatures. The thin film is an organic semiconductor polymer called MEH-PPV.

Christoph Boehme, Associate Professor at the University of Utah, and one of the named authors of the Nature paper, describes the thin film in the Institute of Physics’ nanotechweb.org website story linked to above as an orange-colored "electrically conducting, magnetic field-sensing plastic paint that is dirt cheap. We measure magnetic fields highly accurately with a drop of plastic paint, which costs just as little as drop of regular paint."

The researchers are so enthusiastic about their discovery that they are considering launching a spinoff company to commercialize the technology. The commercial applications for magnetic-field sensors are quite broad, so let’s hope the scientists get some good business advice on which application space to target their technology. Further, they should refrain from three-year projections to having devices on the market, managing investors’ expectations is often the key to success.

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Two Startups Are Bringing Fiber to the Processor

Avicena’s blue microLEDs are the dark horse in a race with Ayar Labs’ laser-based system

5 min read
Diffuse blue light shines from a patterned surface through a ring. A blue cable leads away from it.

Avicena’s microLED chiplets could one day link all the CPUs in a computer cluster together.

Avicena

If a CPU in Seoul sends a byte of data to a processor in Prague, the information covers most of the distance as light, zipping along with no resistance. But put both those processors on the same motherboard, and they’ll need to communicate over energy-sapping copper, which slow the communication speeds possible within computers. Two Silicon Valley startups, Avicena and Ayar Labs, are doing something about that longstanding limit. If they succeed in their attempts to finally bring optical fiber all the way to the processor, it might not just accelerate computing—it might also remake it.

Both companies are developing fiber-connected chiplets, small chips meant to share a high-bandwidth connection with CPUs and other data-hungry silicon in a shared package. They are each ramping up production in 2023, though it may be a couple of years before we see a computer on the market with either product.

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