Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.43: Poster
Montag, 14. März 2011, 14:00–18:00, P4
Vortex imaging in YBCO grain boundary junction SQUIDs using low-temperature scanning electron microscopy — •Matthias Bailer, Christian Gürlich, Matthias Kemmler, M. Turad, Reinhold Kleiner, and Dieter Koelle — Physikalisches Institut - Experimentalphysik II and Center for Collective Quantum Phenomena, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
We used low-temperature scanning electron microscopy (LTSEM)[1] for imaging of Abrikosov vortices in YBa2Cu3O7 (YBCO) washer dc SQUIDs at 77 K, with a spatial resolution of about 1 µm. This imaging technique is based on the electron-beam-induced apparent displacement of vortices, which is detected as a flux change in the SQUID [2]. Vortex images obtained by LTSEM allow e.g. to estimate the distribution of pinning energies in YBCO films, or to image the sheet-current distribution in SQUID washers [3].
We report on recent progress in imaging of single vortices. Using new SQUID designs with bicrystal grain boundary junctions optimized for imaging and detection of the flux noise of a single vortex trapped in the SQUID washer, the investigation of single vortex properties by LTSEM will be presented.
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