Direct observation of local ferromagnetism on carbon in multilayersH.-Ch. Mertins1, S. Valencia2, W. Gudat2, P. M. Oppeneer3, O. Zaharko4 and H. Grimmer4
1 University of Applied Sciences Münster - Stegerwaldstrasse 39 D-48565 Steinfurt, Germany
2 BESSY GmbH - Albert-Einstein Strasse 15, D-12489 Berlin, Germany
3 Leibniz-Institute of Solid State and Materials Research P.O. Box 270016, D-01171 Dresden, Germany
4 PSI, Laboratory for Neutron Scattering - CH-5232 Villigen, Switzerland
(Received 26 August 2003; accepted in final form 31 March 2004)
An element-selective investigation of magnetism on carbon in the vicinity of atoms in a multilayer is reported. We utilize resonant magnetic reflectivity of circularly polarized synchrotron radiation which allows us to distinguish unambiguously the local magnetism on carbon from that on through individual core-level excitations. Clear magnetic signals of carbon are obtained by exploiting the standing-wave technique. Hysteresis loops of individually excited and atoms demonstrate ferromagnetism of at room temperature with a moment of induced by adjacent atoms.
78.20.Ls - Magnetooptical effects.
78.70.Ck - X-ray scattering.
81.05.Uw - Carbon, diamond, graphite.
© EDP Sciences 2004