Regensburg 2004 – wissenschaftliches Programm
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MA: Magnetismus
MA 15: Magnetische dünne Schichten I
MA 15.3: Vortrag
Mittwoch, 10. März 2004, 15:45–16:00, H10
Phase diagram of thin FexCo1−x alloy films on Cu(100) — •Hristo Kolev1, Georgi Rangelov1, Jürgen Braun1, Hyungdon Kang2, and Markus Donath1 — 1Physikalisches Institut, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster — 2Max-Planck-Institut für Plasmaphysik, 85748 Garching
The technological relevance of thin magnetic alloy films has triggered much
scientific activity.
We studied the structure of thin FexCo1−x
alloy films grown on Cu(100) as a function of the film thickness d and Fe
concentration x. Low-energy electron diffraction was applied to determine
the geometrical structure of the films. Electronically structure
information from appearance potential spectroscopy gave us additional
insight in the structural order of the films. For this purpose, a detailed
theoretical analysis of the appearance potential spectroscopy data was
necessary.
Three different regions of structural order have been observed
in the alloy as a function of x and d. In the first region, characterized
by low Fe concentrations, an fcc-structure was found. In the second region
a tendency against the fcc-structure has been observed. A mixture of fcc-
and bcc-order was identified in the alloy. For very high Fe concentrations
the fcc-structure recovers for films thinner than 10 ML.
Combining our
structural information with data from the literature [1] we were able to
develop a comprehensive phase diagram of the thin FexCo1−x films
at room temperature for the two parameters Fe concentration x and film
thickness d.
[1] Dittschar et al., J. Magn. Magn. Mat. 212, 307 (2000).