Element-Selective Magnetic Imaging in Exchange-Coupled Systems by Magnetic Photoemission Microscopy

W. Kuch, R. Frömter, J. Gilles, D. Hartmann, Ch. Ziethen, C. M. Schneider, G. Schönhense, W. Swiech and J. Kirschner
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W. Kuch: Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
R. Frömter: Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
J. Gilles: Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
D. Hartmann: Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
Ch. Ziethen: Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, D-55099 Mainz, Germany
C. M. Schneider: Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, D-55099 Mainz, Germany
G. Schönhense: Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, D-55099 Mainz, Germany
W. Swiech: Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
J. Kirschner: Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

Surface Review and Letters (SRL), 1998, vol. 05, issue 06, 1241-1248

Abstract: We have used a photoemission microscope to obtain element-resolved magnetic contrast in stacked magnetic thin film systems. Magnetic information is thereby provided by X-ray magnetic circular dichroism. Elemental sensitivity, which is crucial for studying magnetic coupling phenomena in systems with several different layers, is achieved by tuning the energy of the illuminating photons to atomic absorption edges. We present measurements of a Ni-coated Co micropattern on Cu(001), and a wedged Co/Cr/Fe(001) sample. In the former sample the Ni magnetization is seen to follow the magnetization of the Co pattern, thereby changing from an out-of-plane easy axis in areas without underlying Co to in-plane on top of the Co microstructures. In the latter a reversal of the exchange coupling of the Co layer to the Fe magnetization is observed when the Cr layer thickness exceeds approximately two monolayers. A small net magnetic moment is also observed in the Cr spacer layer, which follows in sign the Co magnetization at the reversal of the exchange coupling. This finding is discussed in terms of interface roughness or interdiffusion.

Date: 1998
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DOI: 10.1142/S0218625X98001572

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