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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.70: Poster

Mittwoch, 28. März 2012, 15:00–19:00, Poster B

A Low-Temperature Scanning Polarizing Microscope for Magneto-Optical Imaging — •Matthias Grünzweig, Stefan Guénon, Matthias Kemmler, Reinhold Kleiner, and Dieter Koelle — Physikalisches Institut and Center for Collective Quantum Phenomena in LISA⁺, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany

We present the design and preliminary results on the performance of a low-temperature scanning polarizing microscope (LTSPM), which has been developed for research on thin film devices based on ferromagnets (F), superconductors (S) and S-F-hybrid structures. The LTSPM is based on confocal laser microscopy for imaging at temperatures from 4 K to 300 K in magnetic fields up to 0.5 T (in plane) and 5 T (out-of-plane). The LTSPM allows to combine imaging of electrical transport properties (via beam-induced voltage change) with imaging of magnetic structures (via Kerr-/Faraday-effect).

The LTSPM can be applied to research on a broad variety of devices, such as Kerr microscopy on ferromagnetic thin film structures, e.g. magnetic tunnel junctions or S-F heterostructures. Using a magneto-optical sensor layer (e.g. EuSe or an Fe-garnet single crystal) for imaging the magnetic stray field above the sample, the LTSPM shall be used for the investigation of vortex distributions in type-II superconductor thin film devices.