Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session I (Scanning probe methods)

O 35.7: Poster

Dienstag, 15. März 2011, 18:30–22:00, P3

Development of a nanoscale scanning-probe magnetometer with single spin sensitivity — •Eike Oliver Schäfer-Nolte^1,2, Friedemann Reinhard², Markus Ternes¹, Fedor Jelezko², Jörg Wrachtrup², and Klaus Kern¹ — ¹Max-Planck Institut für Festkörperforschung, Stuttgart, Germany — ²3. Physikalisches Institut, Universität Stuttgart, Germany

The detection of weak magnetic fields at small length scales is a long-standing challenge in physics. We report on our work constructing a scanning-probe magnetometer capable to measure small magnetic fields and single spins with sub-nanometer spatial resolution.

This experiment employs a nitrogen-vacancy (NV) center in diamond as an ultrasensitive magnetic field sensor. Its spin state can be monitored using optically detected magnetic resonance [1]. Attaching a nanodiamond containing this "probe spin" to the tip of an atomic force microscope (AFM) working in ultra-high vacuum at low temperature allows studies of magnetic fields at the atomic scale [2,3]. The details of the experimental setup are presented along with experimental data characterizing the individual components.

[1] F. Jelezko et al., phys. stat. sol. (a) 203, No 13 (2006)

[2] G. Balasubramanian et al., nature Vol 455 (2008)

[3] J.M. Taylor et al., nature physics Vol 4 (2008)