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Diamond 'flaws' pave way for nanoscale MRI
Date:11/24/2013

e rather than interactions with spins on the crystal surface.

By controlling the dynamics of these nitrogen impurities separately, they have increased NVC coherence times to a record 0.07 milliseconds longer than any previous report, an order of significant magnitude - putting nanodiamonds back in play as an extremely promising material for quantum sensing.

The results are published today in the journal Nature Materials.

"Our results unleash the potential of the smallest magnetic field and temperature detector in the world. Nanodiamond NVCs can sense the change of such features within a few tens of nanometres - no other sensor has ever had this spatial resolution under ambient conditions," said Helena Knowles, a researcher on the study.

"We now have both high spin coherence and spatial resolution, crucial for various quantum technologies."

Dr Dhiren Kara, who also worked on the study, points out that the nanodiamond's biocompatibility can provide non-invasive optical access to magnetic changes within a living cell - essentially the ability to perform MRI and detect, for instance, a cell's reaction to a drug in real time.

"We may also be able to answer some key questions in material science, such as magnetic ordering at the edges of graphene or the origin of magnetism in oxide materials," Kara said.

Dr Mete Atature, director of the research, added: "The pursuit of simultaneous high NVC coherence and high spatial resolution, and the fact that nanodiamonds couldn't deliver on this promise until now, has required researchers to invest in alternative means including advanced nanofabrication techniques, which tends to be both expensive and low-yield."

"The simplest solution - feasible and inexpensive - was in front of us the whole time."


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Contact: Dr. Mete Atature
ma424@cam.ac.uk
44-787-499-6463
University of Cambridge
Source:Eurekalert  

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