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Nature 417, 392-393 (23 May 2002) | doi:10.1038/417392a
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Applied physics: Making sense of magnetic fields
Yeong-Ah Soh1 & Gabriel Aeppli1
Abstract
Although there have been dramatic advances in generating enormous magnetic fields, measuring these fields remains difficult. A non-metallic sensor based on a silver chalcogenide looks promising.
Over the past half-century, along with the growth in information technology using magnetic disk media, there has been a steady growth in the size of magnetic fields that can be routinely generated by wire coils. Today, steady fields approaching 20 Tesla (T) and pulsed fields as high as 40 T can be reached using relatively compact apparatus; specialized centres such as the US National High Magnetic Field Laboratory have routine access to fields as high as 60 T (for comparison, the Earth's magnetic field is 5 
10-4 T).
- Yeong-Ah Soh and Gabriel Aeppli are at the NEC Research Institute, Princeton, New Jersey 08540, USA.
e-mails: Email: soh@research.nj.nec.com; Email: gabe@research.nj.nec.com
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