D. Wortmann, S. Heinze, Ph. Kurz, G. Bihlmayer, and S. Blügel

We propose the application of the constant-current ( topography ) mode of a spinpolarized scanning tunneling microscope (SP-STM) to investigate the complex (e.g. non-collinear) atomic-scale magnetic structure of otherwise chemically equivalent atoms. The power of this method has recently been demonstrated to give the first experimental evidence of a two-dimensional antiferromagnet.