Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.33: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Impact of aging process on the magnetotransport properties of Co/Pd layered structures — •Afsaneh Farhadi Ghalati1, André Philippi-Kobs1,2, Dieter Lott3, Jonathan Jacobsohn1, Gerrit Winkler1, and Hans Peter Oepen1 — 1Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg, Jungiusstr. 11a, 20355 Hamburg, Germany — 2Coherent X-ray Scattering (FS-CXS), Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22607 Hamburg, Germany — 3Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH, Max-Planck-str. 1, 21502 Geesthacht, Germany
The stability of magnetic thin films is an important issue for their application. In contrast to Co/Pt sandwiches, Co/Pd shows strong changes in the magnetotransport properties over time. Here, over a time span of 600 days, we have investigated the impact of aging on the various magnetoresistance effects present in longitudinal and transverse resistivity of Pd/Co/Pd sandwiches under ambient conditions. Two Co/Pd samples with Co thicknesses of 2 & 7 nm have been prepared via sputtering techniques. The results show strong variations of the MR properties in the first three months followed by a slower change to equilibrium values. However, there are significant differences between both samples reflecting different behavior of Co/Pd systems governed by bulk-like or interface contributions. X-ray reflectivity studies accompanying the MR investigations confirm the aging of the samples and particularly reveal a gradual intermixing of Co and Pd at the interfaces that happens on a time span of several months.