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Schmid-Lorch D, Häberle T, Reinhard F, et al. Relaxometry and Dephasing Imaging of Superparamagnetic Magnetite Nanoparticles Using a Single Qubit. Nano Lett. 2015;15(8):4942-7doi: 10.1021/acs.nanolett.5b00679.
Schmid-Lorch, D., Häberle, T., Reinhard, F., Zappe, A., Slota, M., Bogani, L., Finkler, A., & Wrachtrup, J. (2015). Relaxometry and Dephasing Imaging of Superparamagnetic Magnetite Nanoparticles Using a Single Qubit. Nano letters, 15(8), 4942-7. https://doi.org/10.1021/acs.nanolett.5b00679
Schmid-Lorch, Dominik, et al. "Relaxometry and Dephasing Imaging of Superparamagnetic Magnetite Nanoparticles Using a Single Qubit." Nano letters vol. 15,8 (2015): 4942-7. doi: https://doi.org/10.1021/acs.nanolett.5b00679
Schmid-Lorch D, Häberle T, Reinhard F, Zappe A, Slota M, Bogani L, Finkler A, Wrachtrup J. Relaxometry and Dephasing Imaging of Superparamagnetic Magnetite Nanoparticles Using a Single Qubit. Nano Lett. 2015 Aug 12;15(8):4942-7. doi: 10.1021/acs.nanolett.5b00679. Epub 2015 Jul 30. PMID: 26218205.
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Nano Lett. 2015 Aug 12;15(8):4942-7. doi: 10.1021/acs.nanolett.5b00679. Epub 2015 Jul 30.

Relaxometry and Dephasing Imaging of Superparamagnetic Magnetite Nanoparticles Using a Single Qubit.

Nano letters

Dominik Schmid-Lorch, Thomas Häberle, Friedemann Reinhard, Andrea Zappe, Michael Slota, Lapo Bogani, Amit Finkler, Jörg Wrachtrup

Affiliations

  1. §Department of Materials, University of Oxford, 16 Parks Road, OX1 3PH, Oxford, United Kingdom.
  2. ?Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.

PMID: 26218205 DOI: 10.1021/acs.nanolett.5b00679

Abstract

To study the magnetic dynamics of superparamagnetic nanoparticles, we use scanning probe relaxometry and dephasing of the nitrogen vacancy (NV) center in diamond, characterizing the spin noise of a single 10 nm magnetite particle. Additionally, we show the anisotropy of the NV sensitivity's dependence on the applied decoherence measurement method. By comparing the change in relaxation (T1) and dephasing (T2) time in the NV center when scanning a nanoparticle over it, we are able to extract the nanoparticle's diameter and distance from the NV center using an Ornstein-Uhlenbeck model for the nanoparticle's fluctuations. This scanning probe technique can be used in the future to characterize different spin label substitutes for both medical applications and basic magnetic nanoparticle behavior.

Keywords: Superparamagnetism; T1 relaxation time; T2 dephasing time; scanning probe microscopy,; shallow nitrogen vacancy center

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