Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 55: Poster Session: Superconductivity 2
TT 55.12: Poster
Wednesday, March 22, 2017, 15:00–19:00, P2-OG3
Development of Nb nanoSQUIDs based on SNS junctions for operation in high magnetic fields — •Viacheslav Morosh1, Benedikt Müller2, Julian Linek2, Maria Jose Martinez-Perez2, Oliver Kieler1, Thomas Weimann1, Jörn Beyer3, Thomas Schurig3, Alexander Zorin1, Reinhold Kleiner2, and Dieter Koelle2 — 1Fachbereich Quantenelektronik, Physikalisch-Technische Bundesanstalt (PTB), Braunschweig — 2Physikalisches Institut and Center for Quantum Science (CQ) in LISA+, Universität Tübingen — 3Fachbereich Kryophysik und Spektrometrie, Physikalisch-Technische Bundesanstalt (PTB), Berlin
DC nanoSQUIDs (nSQs) with overdamped SNS sandwich-type (Nb/HfTi/Nb) Josephson junctions (JJ) developed for the investigation of small spin systems will be presented. Our smallest nSQs have JJ with linear dimensions ≤ 100 nm, effective loop areas < 0.03 µm2 and a distance between the JJ of ∼ 30 nm. Nb feeding strip lines of width ∼ 100 nm and thicknesses 160 nm/200 nm have been realized. Due to narrow line widths these nSQs show stable operation in external magnetic fields at least up to ± 0.25 T, which allows manipulating the spins of investigated objects over a wide field range. A magnetic moment sensitivity of a few tens of µB/Hz1/2 has been demonstrated. Results achieved with different nSQ geometries and for single sub-µm JJ up to very high critical current densities ∼ 1 MA/cm2 will be presented. The noise properties including voltage noise of single JJ and flux noise of nSQs will be discussed.
This work was supported by the DFG (KI 698/3-1, KO 1303/12-1, SCHU 1950/5-1).