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Summary form only given. The knowledge on the domain structure of ferro- as well as antiferromagnetic surfaces is essential for the understanding of many physical effects as, e.g., the exchange-bias effect and exchange-coupling in magnetic multilayers. However, especially the investigation of antiferromagnets is difficult because of the lack of a macroscopic magnetization. Spin-polarized scanning tunneling microscopy/spectroscopy (SP-STM/STS) using magnetic probe tips has long been considered as a promising tool in order to study magnetic properties down to the atomic scale.