Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 45: Magnetic Coupling and Spin Structures
MA 45.3: Vortrag
Donnerstag, 14. März 2013, 15:30–15:45, H10
Effect of CoO/Ni exchange coupling on perpendicular magnetization of Ni films on Pd(001) — •Piotr Kuświk1, Pedro L. Gastelois1,2, Waldemar A. A. Macedo2, Marek Przybylski1,3, and Jürgen Kirschner1,4 — 1Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany — 2Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, Brazil — 3Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Kraków, Poland — 4Naturwissenschaftliche Fakultät II, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
The exchange bias effect has been widely investigated in systems presenting in-plane anisotropy. Even more important candidates for developing new technologies are the systems combining magnetic out-of-plane anisotropy and perpendicular exchange bias. We have shown that CoO/Ni bilayer epitaxially grown on Pd(001) exhibits not only the perpendicular magnetization, but also the perpendicular exchange bias effect. Moreover, after cooling it down to T=5K, the initially in-plane easy magnetization axis of the Ni underlayers in the thickness range of 17-25ML, exhibits not only strong exchange coupling, but also perpendicular anisotropy. The coupling at the CoO/Ni interface is indicated by strongly enhanced coercivity with respect to the uncovered Ni films, and exchange bias field of 200Oe. At T=290K, coercivity decreases to the value for the uncovered Ni films and exchange bias disappears, which indicates that coupling exists only below the Néel temperature of CoO.