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Schlickum, U., Janke-Gilman, N., Wulfhekel, W., Kirschner, J.

Step-induced frustration of antiferromagnetic order in Mn on Fe(001)
Physical Review Letters 92, (10),pp 107203/1-4 (2004)
We studied the spin arrangement in ultrathin antiferromagnetic Mn films in contact with a ferromagnetic Fe(001) substrate using spin-polarized scanning tunneling microscopy. Mn shows a layerwise antiferromagnetic order on Fe(001). In regions where Mn overgrows Fe steps, a frustration of the antiferromagnetic order occurs which is similar to a 180° domain wall. This topologically enforced frustration was studied as a function of Mn thickness. A linear increase of the width of the frustration region with the Mn thickness was found.