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Arthur T Knackerbracket has found the following story:

Japanese researchers have optimized the design of laboratory-grown, synthetic diamonds. This brings the new technology one step closer to enhancing biosensing applications, such as magnetic brain imaging. The advantages of this layered, sandwichlike, diamond structure are described in a recent issue of Applied Physics Letters, from AIP Publishing.

[...] Diamonds designed with nitrogen-vacancy (NV) centers that can detect changes in magnetic fields are a powerful tool for biosensing technologies and used in the medical detection and diagnosis of disease. For instance, magnetoencephalography (MEG) is a neuroimaging technique used to map brain activity and trace pathological abnormalities, such as epileptic tissue.

[...] "At the moment, we have just demonstrated stabilization, but we expect it to also improve sensitivity," Mizuochi said. His team is currently testing the sensitivity of the new design to changes in magnetic fields, and hoping that this structure could be used for biosensing applications such as MEG.

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