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.
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Soh, YA., Aeppli, G. Making sense of magnetic fields. Nature 417, 392–393 (2002). https://doi.org/10.1038/417392a
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DOI: https://doi.org/10.1038/417392a
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