Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 39: Micro- and Nanostructured Magnetic Materials I
MA 39.4: Vortrag
Donnerstag, 29. März 2012, 10:15–10:30, EB 202
Magnetic coupling and magnetic anisotropy of iron doped platinum wires — •Lucila Juarez and Gustavo Pastor — Institut für Theoretische Physik, Universität Kassel, Germany
We report a first principles study of the magnetic coupling and magnetic anisotropy in monoatomic freestanding FePtn wires (n=1−4) focusing mainly on the case where iron dopands are equally spaced along the chain. The magnetic coupling between iron dopands was found to change from antiferromagnetic to ferromagnetic depending on the position that impurities occupy with respect to each other. The results can be understood analysing the magnetic polarization of platinum atoms in chains doped with iron at very low concentations. Large anisotropies are present in spin and orbital moments of platinum atoms leading to magnetic anisotropy energies in the order of 10meV /at for some concentrations. The orbital moment of iron atoms couples antiferromagnetically to its spin moment for in chain axis magnetization. However, this does not lead to the destabilization of the easy axis.