Europhys. Lett, 46 (2), pp. 231-237 (1999)
Parallel, antiparallel and no magnetic coupling
in submonolayer Mn on Fe(110)
O. Rader 1, C. Pampuch 1,
W. Gudat 1, A.
C. Carbone 2 and W. Eberhardt 2
1 Berliner Elektronenspeicherring-Gesellschaft
für Synchrotronstrahlung (BESSY)
Lentzeallee 100, D-14195 Berlin, Germany
2 Institut für Festkörperforschung, Forschungszentrum Jülich - D-52425 Jülich, Germany
(received 7 August 1998; accepted in final form 1 February 1999)
PACS. 73.20Hb - Impurity and defect levels; energy
states of adsorbed species.
PACS. 75.30Pd - Surface magnetism.
An unusual sequence of magnetic couplings in the epitaxial-growth system Mn/ Fe(110) is revealed using the element-selective magnetic circular X-ray dichroism (MCXD) method. Clean Mn shows an unprecedented vanishing magnetization up to 0.3 monolayers (ML). At 0.4 ML a parallel Mn-Fe coupling sets in with relatively small net Mn moment ( for 0.4-2 ML). Successive adsorption of oxygen changes the Mn-Fe coupling from parallel to zero to antiparallel and eventually to zero again.