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Detectors and sensors

Detectors and sensors

Ultrasensitive magnetic-field sensor could be made from a wobbling compass needle

17 May 2016 Hamish Johnston
Photograph of a compass
If shrunken down to micron size, a compass needle could wobble. (Courtesy: iStockphoto/tobias machhaus)
A tiny magnetic needle just 10 μm long could be used to create a magnetic-field sensor that – if

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Hamish Johnston is an online editor of Physics World
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