Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 55: Poster Session: Superconductivity 2
TT 55.14: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P2-OG3
YBa2Cu3O7 nanoSQUIDs for the investigation of single magnetic nanoparticles over a wide range of temperature and magnetic field — •Dennis Schwebius1, Benedikt Müller1, Maria José Martínez-Pérez1, Jianxin Lin1, Dana Korinski1, Reinhold Kleiner1, Javier Sesé2, and Dieter Koelle1 — 1Physikalisches Institut and Center for Quantum Science (CQ) in LISA+, Universität Tübingen, Germany — 2Laboratorio de Microscopías Avanzadas (LMA), Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, Spain
NanoSQUIDs based on the cuprate superconductor YBa2Cu3O7 (YBCO) are promising devices for the investigation of single magnetic nanoparticles (MNPs), as they offer high spin sensitivity down to a few Bohr magnetons/√Hz, combined with the possibility to operate them over a wide range of temperature (up to ∼ 80 K) and magnetic field (up to the Tesla range). Here, we present our efforts to optimize the performance and reliable operation of YBCO nanoSQUIDs, based on grain boundary Josephson junctions, in strong magnetic fields applied in the plane of the SQUID loop and perpendicular to the grain boundary plane. Special care has to be taken on the precise alignment of the external magnetic field. Moreover, we present first results on the characterization of the magnetic properties of Co MNPs, grown by focused electron beam induced depostion directly on top of the SQUID loops, demonstrating the feasibility of using YBCO nanoSQUIDs for single MNP measurements.