We have developed an apertureless Scanning Near field Optical Microscope (SNOM) in transmission, devoted to near field magneto-optics. Our apertureless SNOM combines an inverted optical microscope, which has been adapted to Faraday effect imaging, with a commercial stand-alone Scanning Probe Microscope, used in Atomic Force Microscope (AFM) mode. Two different probes are validated as apertureless SNOM tips: a home-made etched tungsten wire and a commercial AFM silicon probe. We present and analyze preliminary images of the doMayn structure in iron garnets. They indicate a SNOM resolution clearly in the sub-micrometric range. Besides, the near field magneto-optical image presents some unexpected features, not revealed in far field images.
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Wioland et al. (1999) studied this question.
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