Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.1: Poster
Tuesday, March 17, 2015, 09:30–13:00, Poster A
Tracking Temperature Dependent Relaxation Times of Individual Protein Molecules using NV-Magnetometry — •Lukas Schlipf1, Eike Schäfer-Nolte1, Thomas White1, Markus Ternes1, Amit Finkler2, Friedemann Reinhard2, Jörg Wrachtrup1, 2, and Klaus Kern1, 3 — 1Max-Planck Institute for Solid State Research, 70569 Stuttgart, Germany — 23rd Institute of Physics and Research Center SCoPE, University Stuttgart, 70569 Stuttgart, Germany — 3Institut de Physique de la Matière Condensée, Ecole Polytechnique Fédérale de 8 Lausanne (EPFL), CH-1015 Lausanne, Switzerland
The nitrogen-vacancy (NV) center in diamond is a true single-spin magnetometer, whose spin-state can be initialized and read-out optically enabling sensing of even single-electron spins in various systems, including molecules. We demonstrate the tracking of the spin dynamics of ensemble and individual magnetic ferritin proteins using this magnetic sensor in an ultra high vacuum environment and a temperature from 4 K to 300 K [1]. We employ different detection protocols to probe the influence of the ferritin nanomagnets on the longitudinal and transverse relaxation times of the NV center. The temperature dependence of the observed spectral features can be well understood by the thermally induced magnetization reversals of the ferritin [2]. Using an integrated scanning probe we can also increase the spatial resolution of our measurements with the goal of reaching single-molecule sensitivity. [1] E. Schäfer-Nolte et al., Rev. Sci. Instr. 85, 013701 (2014) [2] E. Schäfer-Nolte et al., Phys. Rev. Lett. 113, 217204 (2014).