Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 7: Magnetische dünne Schichten II
MA 7.10: Vortrag
Freitag, 4. März 2005, 17:30–17:45, TU H1012
Influence of deposition method on magnetism of Fe and Co films on Pd(001) — •Y. Shi1, M. Przybylski1, M. Rams2, J. Barthel1, H. L. Meyerheim1, and J. Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle — 2Institute of Physics, Jagiellonian University, Reymonta 4, PL-30-059, Krakow
Pd is predicted to be polarized by hybridization within a magnetic neighborhood like Fe and Co. Thus, ferromagnetic order in ultrathin Fe and Co films, mediated by the Pd substrate, could be expected even below the percolation threshold, i.e. in the submonolayer regime. We investigated magnetism of Fe and Co on Pd(001) in a thickness range from 0 to 10 monolayers (ML) for films deposited at room temperature by either thermal deposition (TD) or by pulsed laser deposition (PLD). In-plane Kerr rotation measured in saturation immediately after the film deposition shows similar thickness dependence for Fe and Co, with differences between PLD- and TD-grown films below a thickness of 2 ML. In particular, PLD Fe films at low temperature (70 K) exhibit long range order starting from a coverage around 0.2 ML, while the onset of ferromagnetism in Fe films prepared by TD is observed only at 0.5 ML, which is about the percolation threshold. Linear extrapolation of the magneto-optical response at higher film thickness to zero thickness reveals an offset in Kerr rotation equivalent to the signal of more than one ML for PLD films, but less than one ML for TD films. MOKE results for PLD Fe/Pd(001) are discussed in comparison to SQUID measurements of the same system.