Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.33: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Spatially resolved SQUID-NMR measurement instrumentation for investigation of superfluid 3He-thin-films — •Josepha Altmann1, Sylke Bechstein1, Joern Beyer1, Oliver Kieler2, Silke Wolter2, Andrew Casey3, and John Saunders317.6 Kryosensorik, Physikalisch-Technische Bundesanstalt Berlin — 22.4 Quantenelektronik, Physikalisch-Technische Bundesanstalt Braunschweig — 3Department of Physics, Royal Holloway University of London

Superfluid 3He stands out as an unique and sophisticated condensed matter system. At the Royal Holloway University of London the different phases of 3He-thin-films with heights varying from 100 nm up to 1100 nm are investigated to study the topological effects of the superfluid. To measure the phase diagram nuclear magnetic resonance (NMR) spectroscopy is used. In our setup, a Superconducting Quantum Interference Device (SQUID), designed as a current sensor, measures the NMR signal. To specify the location of the NMR signal, spatially resolving pick-up-coils are employed with dimensions ranging from 10 µm to 400 µm. Concurrently, coil inductances from about 20 nH up to 20 µH are needed to match well to the input circuit of SQUID current sensors. Electron beam lithography (EBL) enables the fabrication of superconducting planar structures with sub-µm-dimensions and thus a high ratio of inductance to coil size. We present the design, EBL-based fabrication and characterization of fine-pitch superconducting Nb-coils with line widths of 200 nm and their foreseen application in spatially resolved NMR on superfluid 3He-thin-films.

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