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MA: Fachverband Magnetismus

MA 10: Magnetic Imaging

MA 10.4: Talk

Monday, March 23, 2009, 18:00–18:15, HSZ 403

Nanoscale imaging magnetometry with single spins in diamond — •Julia Tisler, Gopalakrishnan Balasubramanian, Roman Kolesov, Fedor Jelezko, and Joerg Wrachtrup — 3. Physikalisches Institut, Universitaet Stuttgart

It is shown that single electron spin of a nitrogen vacancy center in diamond can be used as a magnetometer for sensing and imaging weak magnetic fields under ambient conditions. The nitrogen vacancy center is an atomic sensor, has an additional advantage that it can be attached to the tip of a scanning probe and used to measure or image magnetic field at nanometer length scales. The setup to perform this nanoscale magnetometry consists of a combined confocal fluorescent microscope, atomic force microscope and optically detected magnetic resonance setup. We demonstrated this novel magnetometry by imaging the magnetic field created by a magnetic nanostructure. The magnetic field lines as small as 5mT were imaged using this technique. To perform ultra sensitive magnetic field measurements we used a nitrogen vacancy center in an isotopically pure bulk diamond which has a coherence time of 2ms. By synchronizing a hahn echo sequence with the external magnetic field we achieved a resolution of 4nT(Hz)-1/2. This method could have impact in life science, because it has the potential to probe single spins in living cells.