Europhys. Lett.
Volume 66, Number 5, June 2004
Page(s) 743 - 748
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 May 2004
Europhys. Lett., 66 (5) , pp. 743-748 (2004)
DOI: 10.1209/epl/i2003-10253-5

Direct observation of local ferromagnetism on carbon in $\chem{C/Fe}$ multilayers

H.-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 $\chem{Fe}$ atoms in a $\chem{C/Fe}$ 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 $\chem{Fe}$ through individual core-level excitations. Clear magnetic signals of carbon are obtained by exploiting the standing-wave technique. Hysteresis loops of individually excited $\chem{C}$ and $\chem{Fe}$ atoms demonstrate ferromagnetism of $\chem{C}$ at room temperature with a moment of $\approx 0.05{\mu_\ab{B}}$ induced by adjacent $\chem{Fe}$ atoms.

78.20.Ls - Magnetooptical effects.
78.70.Ck - X-ray scattering.
81.05.Uw - Carbon, diamond, graphite.

© EDP Sciences 2004