Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Magnetic Thin Films II

MA 23.11: Vortrag

Mittwoch, 25. März 2009, 17:15–17:30, HSZ 04

Interlayer coupling of orthogonally magnetized (Rh/Fe_1−xCo_x)_N/Rh(001) thin films — •Fikret Yildiz, Marek Przybylski, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany

We report on fully epitaxial (Rh/Fe_1−xCo_x)_N/Rh(001) exchange-coupled multilayer system in which every other magnetic layer (Fe_1−xCo_x, 0.4 < x < 0.6) has an easy-magnetization axis perpendicular to the multilayer plane, and the intermediate Fe or Co (i.e. for x = 0 and x = 1, respectively) layers are magnetized in plane. A strong perpendicular magnetic anisotropy in the Fe_1−xCo_x films grown on Rh(001) originates from an appropriate tetragonal distortion and varies with the film composition with a maximum around x = 0.5. The most attractive advantage of the system is that the magnetic anisotropy can be continuously tuned by varying the alloy film composition. The magnetic layers are separated by Rh non-magnetic spacers which mediate a ferro- or antiferromagnetic exchange coupling depending on the thickness The Rh spacer layers support the distortion and thus the perpendicular easy magnetization axis up to tens of MLs. In reality the magnetization does not alternate between out-of-plane for the Fe_1−xCo_x and in-plane for the Fe (or Co) layers since the interlayer exchange interaction tends to orient the magnetization of both layers in parallel.