Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 67: Poster 4

MA 67.22: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG3

High magnetic field gradient tips for single spin resonance imaging — •Philipp Scheiger, Thomas Oeckinghaus, Rainer Stöhr, Amit Finkler, and Jörg Wrachtrup — 3. Physikalisches Institut, Universität Stuttgart

Due to its high sensitivity to small magnetic fields at room temperature, the nitrogen-vacancy center (NV center) in diamond is a promising tool for resonance imaging of single electron spins in molecules using atomic force microscopy (AFM) techniques under ambient conditions. Using the spin-labels in molecules, the only limitation in imaging single spins in molecules with the NV center, is the spatial resolution. Every electron spin in resonance with the measurement scheme contributes to the signal and thereby reduces the probability of detecting single spins. The aim of this work is to spatially restrict the number of resonant electron spins by using a strong magnetic field gradient. Since strong off-axis magnetic fields disturb the optical readout of the NV center spin state, we try to fabricate magnetic tips with low total magnetic field strength but with a gradient in the range of 10G/nm. Commercially available magnets, like AFM tips, do not generate such fields. This work is split up into three steps, first the micromagnetic simulation of the required geometry, secondly the fabrication of high gradient magnetic on tips and finally the integration of such tips into an AFM setup for measurements with an NV center.