Posts Tagged ‘nanomagnetismo’

Nanoscale magnetic sensing with an individual
electronic spin in diamond

Detection of weak magnetic fields with nanoscale spatial resolution
is an outstanding problem in the biological and physical
sciences. For example, at a distance of 10 nm, the spin of a single
electron produces a magnetic field of about 1 mT, and the corresponding
field from a single proton is a few nanoteslas. A sensor
able to detect such magnetic fields with nanometre spatial resolution
would enable powerful applications, ranging from the detection
of magnetic resonance signals from individual electron or
nuclear spins in complex biological molecules to readout of classical
or quantum bits of information encoded in an electron or
nuclear spin memory. Here we experimentally demonstrate an
approach to such nanoscale magnetic sensing, using coherent
manipulation of an individual electronic spin qubit associated
with a nitrogen-vacancy impurity in diamond at room temperature.
Using an ultra-pure diamond sample, we achieve detection
of 3 nT magnetic fields at kilohertz frequencies after 100 s of averaging.
In addition, we demonstrate a sensitivity of 0.5 mTHz1/2 [microtesla.(Hz na potência -1/2)]
for a diamond nanocrystal with a diameter of 30 nm.
Este artigo de J. R. Maze et al. e outros sobre nanomagnetismo encontram-se em: http://www.nature.com/nature/journal/v455/n7213.

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