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

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• 作者：Dominik Schmid-Lorch ; Thomas H盲berle ; Friedemann Reinhard ; Andrea Zappe ; Michael Slota ; Lapo Bogani ; Amit Finkler ; J枚rg Wrachtrup
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：August 12, 2015
• 年：2015
• 卷：15
• 期：8
• 页码：4942-4947
• 全文大小：398K
• ISSN：1530-6992

文摘

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鈥檚 dependence on the applied decoherence measurement method. By comparing the change in relaxation (T<sub>1sub>) and dephasing (T<sub>2sub>) time in the NV center when scanning a nanoparticle over it, we are able to extract the nanoparticle鈥檚 diameter and distance from the NV center using an Ornstein鈥揢hlenbeck model for the nanoparticle鈥檚 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.