  The occurrence of a noncollinear magnetic structure at a Mn monolayer grown
epitaxially on Fe(100) is predicted theoretically, using spinor
density-functional theory, and observed experimentally, using x-ray magnetic
circular dichroism (XMCD) and linear dichroism (XMLD) spectroscopies. The
combined use of XMCD and XMLD at the Mn-absorption edge allows us to assess the
existence of ferromagnetic and antiferromagnetic order at the interface, and
also to determine the moment orientations with element specificity. The
experimental results thus obtained are in excellent agreement with the magnetic
structure determined theoretically.
