Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 7: Magnetische dünne Schichten II
MA 7.4: Vortrag
Freitag, 4. März 2005, 16:00–16:15, TU H1012
Magneto-optical signal superposition in ultra-thin Co/Pd structures — •M. Przybylski, M. Nyvlt, and J. Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle
Magnetism of ultrathin Co films grown on clean and atomically flat surfaces of Pd single crystals was studied by magneto-optical (MO) Kerr rotation. The films show very similar behavior independently of the crystallographic orientation of the Pd-substrate surface. Polar MO loops change sign of the MO signal at certain critical thickness, tc, which varies for different substrate planes and growth conditions. This effect is attributed to a competition between two MO components with different signs originating from the Co-Pd interface and from the inner part of the Co film. At tc these two contributions cancel each other. For the Co films grown on the No-dqopenNo-dq Pd(110) surface reversed polar MO loops are detected at low Co coverage after deposition at room temperature and tc slightly increases with increasing annealing temperature. For Co grown on the most densely packed Pd(111) the same behavior is observed after growing the film above 400 K. The critical thickness at which the polar loops change polarity relates to the Co/Pd interface and does not vary with the expanding thickness range at which the out-of-plane magnetization is kept.