Abstract
The magnetic coupling between epitaxial single-crystalline Co and FeMn layers on Cu(001) was investigated by element-resolved magnetic circular dichroism domain imaging using a photoelectron emission microscope. As-grown Co domain patterns reveal the presence of many small domains in the antiferromagnet. The coupling of the Co layer is found to be along $〈100〉$ crystallographic directions. This is discussed in terms of a $45\ifmmode^\circ\else\textdegree\fi{}$ coupling due to frustrations at topological $90\ifmmode^\circ\else\textdegree\fi{}$ domains in the FeMn layer. Coercivity oscillations as a function of FeMn thickness with atomic monolayer period support the importance of such step-induced domains in the coupling.
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