Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: POSTER II

MA 49.10: Poster

Donnerstag, 19. März 2015, 15:00–18:00, Poster A

A High-Resolution Confocal Scanning Polarizing Microscope for Low-Temperature Magneto-Optical Imaging — •Matthias Lange, Stefan Guénon, 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

The magneto-optical Kerr effect (MOKE) is widely used for the investigation of magnetic materials. We present a confocal laser scanning microscopy setup that is capable of simultaneously imaging the surface’s reflectivity (conventional image), the in-plane and out-of-plane magnetization components, and electric transport characteristics of the sample. The magnetization components are imaged exploiting the longitudinal and polar MOKE. Information on the electric transport characteristics can be gained from local laser heating, combined with the detection of beam-induced changes of the voltage across current-biased samples, which yields a spatial resolution of ∼ 1 µm. Through the use of a high numerical aperture microscope objective, an optical resolution of about 220 nm at a wavelength of 405 nm is achieved. The sample is mounted on a continuous flow cryostat providing a temperature range between 5 K and 300 K. An electromagnet is used to apply magnetic fields of up to 800 mT with variable in-plane orientation.