Surface and interface magnetic moments of
Institut für Experimentalphysik, Freie Universität Berlin Arnimallee 14,
D-14195 Berlin-Dahlem, Germany
Accepted: 30 March 2001
The novel compatibility of SQUID magnetometry with ultrahigh vacuum chambers allows for measuring the magnetic moment with submonolayer sensitivity of the same ultrathin film before and after capping with a protective layer. The contributions of the surface and the interface magnetic layers can be separated. We show that the Co surface atoms carry a moment of /atom enhanced by 32(5)% while the interface ones are reduced by to /atom compared to the bulk value of /atom. This surprisingly large difference between a vacuum facing Co surface and a Co/Cu interface is of fundamental importance.
PACS: 75.70.Rf – Surface magnetism / 75.70.Ak – Magnetic properties of monolayers and thin films
© EDP Sciences, 2001