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MA: Fachverband Magnetismus

MA 6: Magnetic Instrumentation and Characterization

MA 6.3: Vortrag

Montag, 20. März 2017, 10:00–10:15, HSZ 403

Nuclear Magnetic Resonance Force Microscopy at milliKelvin Temperatures — •Gesa Welker, Martin de Wit, Jelmer Wagenaar, Marc de Voogd, Arthur den Haan, Tom van der Reep, Lucia Bossoni, and Tjerk Oosterkamp — Leiden Institute of Physics, Leiden, The Netherlands

Magnetic Resonance Force Microscopy combines Atomic Force Microscopy with Nuclear Magnetic Resonance and aims to obtain a 3D-image with nm-resolution. In the last decade, progress has been made in improving the resolution of this technique, enabling this technique to image a Tobacco Virus with 5 nm resolution [1]. In conventional setups, a laser is used as detection method, giving significant heating of the resonator at temperatures below 1 Kelvin. Our MRFM makes use of superconducting NbTiN detector chips in combination with a Superconducting Quantum Interference Device (SQUID), to generate the necessary RF magnetic fields and to detect the motion of the force sensor. These modifications have allowed us to operate our MRFM at temperatures as low as 20 mK [2], improving the sensitivity towards single spin and opening possibilities to use this technique for interesting condensed matter systems, such as topological insulators, iron-doped palladium, and nitrogen-vacancy centers in diamond.

[1] C. L. Degen et al., Proc. Natl. Acad. Sci. U. S. A. 106, 1313 (2009).

[2] J. J. T. Wagenaar et al., Phys. Rev. Applied 6, 014007 (2016).