Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 8: Magnetische Kopplungsph
änomene / Exchange Bias
MA 8.1: Vortrag
Montag, 24. März 2003, 15:15–15:30, HSZ/405
Direct Observation of the Conduction Electron Spin Polarization in the Ag Spacer of a Fe/Ag/Fe Trilayer — •H. Luetkens1,2, J. Korecki3,4, E. Morenzoni2, T. Prokscha2, M. Birke1, H. Glückler2, R. Khasanov2,5, H.-H. Klauss1, T. Ślezak3, A. Suter2, E.M. Forgan6, Ch. Niedermayer7, and F.J. Litterst1 — 1Institut für Metallphysik und Nukleare Festkörperphysik, TU-Braunschweig, Germany — 2Paul Scherrer Institut, Labor für Myonenspinspektroskopie, Villigen PSI, Switzerland — 3Faculty of Physics und Nuclear Techniques, Academy of Mining and Metallurgy, Kraków, Poland — 4Institute of Catalysis and Surface Chemistry, Polish Academy of Science, Kraków, Poland — 5Physik Institut der Universität Zürich, Switzerland — 6School of Physics and Astronomy, University of Birmingham, United Kingdom — 7Fakultät für Physik, Universität Konstanz, Germany
The spatially oscillating electron spin polarization in the Ag spacer of a 4 nm Fe/ 20 nm Ag/ 4 nm Fe(001) epitaxial trilayer has been determined directly by means of low energy muon spin rotation (LE-µSR). It oscillates with the same period as the interlayer exchange coupling in this system, but with a much weaker attenuation of the polarization at large distances d from the interface. The measured magnetization profile from the inner 12 nm of the spacer is described by an oscillating polarization decaying as d−0.8(1). This unusual behavior may arise from a full confinement of electron states within the spacer. These measurements are complemented by depth dependent LE-µSR investigations on a 4 nm Fe/ 300nm Ag bilayer.