Dresden 2003 – scientific programme
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DS: Dünne Schichten
DS 14: Magnetische Schichten
DS 14.1: Talk
Wednesday, March 26, 2003, 15:15–15:30, GER/38
Magneto-optical properties of Fe/Cr/Fe trilayers epitaxially grown on GaAs(001) — •Marek Przybylski1,2, Jerzy Grabowski1,2, Wulf Wulfhekel1, Miroslaw Nyvlt1,3, Michal Rams4, Krzysztof Tomala4, and Jurgen Kirschner1 — 1Max-Planck-Institut fur Mikrostrukturphysik, Halle, Germany — 2Solid State Physics Department, Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy, Krakow, Poland — 3Institute of Physics, Charles University, Praha, Czech Republik — 4Institute of Physics, Jagiellonian University, Krakow, Poland
Fe/Cr/Fe trilayers were epitaxially grown on atomically flat GaAs(001). For the thicknesses of Cr spacer layer corresponding to antiferromagnetic coupling, reversed minor hysteresis loops were measured with longitudinal MOKE, i.e. negative magnetization signal was measured when the thicker bottom Fe layer was saturated along the applied field. This behaviour is interpreted by depth variations of the MOKE sensitivity. Magnetization reversal shows that both antiferromagnetic switching and spin-flop transition fields depend on the ratio of both Fe film thicknesses. SQUID measurements confirm the interpretation of the MOKE loops and demonstrate homogeneity and sharpness of the interfaces in our structures. The shape of the MOKE loops becomes more complex with further deposition of MgO and Fe layers on the top of the Fe/Cr/F/GaAs(001) stack. Individual contributions of all Fe layers follow predictions of the magneto-optical calculations.