Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 25: Magnetic Imaging
MA 25.6: Talk
Wednesday, March 18, 2015, 10:45–11:00, H 1012
Relaxometry imaging of superparamagnetic magnetite nanoparticles using a single qubit — •Dominik Schmid-Lorch1, Thomas Häberle1, Andrea Zappe1, Friedemann Reinhard1,2, Amit Finkler1, and Jörg Wrachtrup1 — 13. Physikalisches Institut und Forschungszentrum SCoPE, Universität Stuttgart, Germany — 2Walter Schottky Insititut, Technische Universität München, Germany
We present a novel technique to image superparamagnetic iron oxide nanoparticles via their fluctuating magnetic fields. The detection is based on the nitrogen-vacancy (NV) color center in diamond, which allows optically detected magnetic resonance (ODMR) measurements on its electron spin structure. In combination with an atomic-force-microscope, this atomic-sized color center maps ambient magnetic fields in a wide frequency range from DC up to several GHz [1], while retaining a high spatial resolution in the sub-nanometer range [2].
We demonstrate imaging of single 10 nm sized magnetite nanoparticles using this spin noise detection technique. By fitting simulations (Ornstein-Uhlenbeck process) to the data, we are able to infer additional information on such a particle and its dynamics, like the attempt frequency and the anisotropy constant. This is of high interest to the proposed application of magnetite nanoparticles as an alternative MRI contrast agent or to the field of particle-aided tumor hyperthermia [3].
[1] E. Schäfer-Nolte et al., Phys. Rev. Lett. 113, 217204 (2014)
[2] P. Maletinsky et al., Nat. Nanotech. Vol. 7, 320-4 (2012)
[3] R. Hergt et al., J. Phys.: Condens. Matter 18 S2919-S2934 (2006)