Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Magnetic Thin Films II of 2
MA 27.10: Vortrag
Mittwoch, 13. März 2013, 17:30–17:45, H3
Quantum well states in Cu and oscillatory magnetic anisotropy in Cu/Fe and Cu/Co bilayers — •Sujit Manna1, Pedro L. Gastelois1,2, Maciej Dabrowski1, Piotr Kuświk1, Marek Cinal3, Marek Przybylski1,4, and Jürgen Kirschner1,5 — 1Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 2Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, Brazil — 3Institute of Physical Chemistry of the Polish Academy of Sciences, Warszawa, Poland — 4Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Kraków, Poland — 5Naturwissenschaftliche Fakultät II, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
From our previous experiments it is obvious that the strong effect of quantum well states (QWS) formed by d-electrons on magnetic anisotropy (MA) of Fe and Co films exists at low temperature only. In case of nonmagnetic/ferromagnetic bilayers one can expect changes of MA due to the QWS formed in the nonmagnetic cover layer. In an extension of the previously reported experiment [1], we were able to observe oscillatory magnetic anisotropy of large amplitude at T=5K for both Co and Fe films due to QWS formed in the Cu overlayer. We explain such quantum oscillation of MA as originating from d-QWS formed in Fe and/or Co, but hybridized to the sp-QWS formed in the Cu film and penetrating to the Fe and/or Co films. The period of MA oscillations for Cu/Fe is found to be independent of the Fe film thickness, in agreement with our theoretical predictions. [1] Ch. Würsch et al., Nature 389, 937 (1997).