Aufbau eines magnetooptischen Rasternahfeldmikroskops im Reflexionsmodus und Test an periodischen Mikrostrukturen und magnetooptischen Speichermedien
Construction of a magneto-optic scanning near-field microscope in reflection mode and test on periodic microstructures and magneto-optic storage media. The scanning near-field optical microscope (SNOM) enhances the diffraction-limited resolution of a conventional microscope. In this work a magneto-optical SNOM, which can measure the Faraday and Kerr rotation of transparent respective opaque samples quantitatively with high spatial resolution, was built. After an introduction into the principles of near-field optics and magneto-optics the experimental set-up of a SNOM is outlined with special emphasis on the properties of near-field light sources. One part of the work is dedicated to the dependence of the optical and magneto-optical signal on the sample topography. It is shown that topographic sample features induce strong artifacts in high-resolution optical and magneto-optical images. A model for simulating these artifacts is presented. Based on these findings the magneto-optical data acquired on magneto-optic storage media and Co/Pt test samples are interpreted. Kerr rotations of 0.4 degrees have been locally resolved in reflection mode. Sub-wavelength-sized magnetic domains have been measured in transmission mode using visible light (lambda = 488 nm).
info:eu-repo/classification/ddc/530, Physik, Optisches Nahfeldmikroskop, Magnetooptik
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