Münster 1997 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 22: Magnetische Schichten I

DS 22.3: Vortrag

Donnerstag, 20. März 1997, 10:45–11:00, PC 7

Morphology and magnetization changes upon annealing of
Cu/Fe/Cu(100)-ultrathin films studied in-situ by STM,
MOKE, and Kerr microscopy — •E. Mentz, D. Weiss, A. Bauer, and G. Kaindl — Institut f"ur Experimentalphysik, Freie Universit"at Berlin, Arnimallee 14, D-14195 Berlin

The low-temperature growth at 80 K of Fe/Cu(100) up to 8 monolayers (ML) Fe and the influence of subsequent annealing up to 420 K on film morphology and magnetism is investigated. Furthermore, the growth of 1 ML Cu on differently prepared Fe/Cu(100) films and its consequences for the magnetism is studied. Results of in-situ STM, MOKE and Kerr microscopy measurements in ultra-high vacuum are presented. Low-temperature grown Fe/Cu(100) films are granular but are expected to have an abrupt interface. Annealing between 350 K and 420 K leads to extremely flat surfaces, exhibiting needle-like dislocations that indicate local fcc-bcc transitions. Interestingly, the out-of-plane to in-plane magnetization transition observed at ≈ 5 ML for the as-grown Fe films shifts to larger Fe thicknesses and occurs at around 7 ML for the annealed films. On the annealed Fe film surfaces, Cu grows epitaxially in a bilayer-growth mode. Deposition of Cu onto the as-grown Fe films and subsequent annealing, on the other hand, leads to smooth films with a Cu-Fe surface alloy. In both cases the magnetization of the films is diminished.