Regensburg 1998 – scientific programme
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AM: Magnetismus
AM 1: Oberflächenmagnetismus I
AM 1.4: Talk
Monday, March 23, 1998, 10:45–11:00, H10
Interface alloying and detoriation of the magnetic properties in Co/Cu(001) — •S. van Dijken, L.C. Jorritsma, A.J.G. de Vries, and B. Poelsema — Universiteit Twente, PO Box 217, 7500 AE Enschede, The Netherlands
The initial growth of Co-films on Cu(001) and their magnetic properties are studied in a wide temperature range using helium diffraction (TEAS), high resolution low energy electron diffraction (SPA-LEED) and sensitive magneto-optical (SMOKE) measurements. TEAS shows that first an almost perfect bilayer is grown even at relatively low temperatures (∼250 K). Its microscopic origin is discussed. SPA-LEED data reveal a distinct anomaly in the temperature dependence of the island separation occurring at about 325 K, where the drastic decrease of the separation and a clear broadening of the separation distribution function is attibuted to the onset of interface alloying. This morphological change coincides with a substantial decay of the Curie temperature, TC, of a 2 ML thick Co film as detected with SMOKE measurements and compared to those found for films grown between 250 and 300 K. A lower TC is also found for different reasons (film roughness!) at deposition temperatures below 225 K.