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Regensburg 2004 – scientific programme

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MA: Magnetismus

MA 15: Magnetische dünne Schichten I

MA 15.3: Talk

Wednesday, March 10, 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 Donath11Physikalisches 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).

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