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.