Dresden 2003 – wissenschaftliches Programm

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MA: Magnetismus

MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)

MA 14.92: Poster

Dienstag, 25. März 2003, 15:15–19:15, Zelt

Growth and spin-resolved photoemission spectroscopy of the epitaxial α-Al₂O₃/Fe(110) system — •Yu. S. Dedkov¹, M. Fonin¹, G. Güntherodt¹, and U. Rüdiger² — ¹II. Physikalisches Institut, Rheinisch-Westfälische Technische Hochschule Aachen, D-52056 Aachen, Germany — ²Fachbereich Physik, Universität Konstanz, D-78434, Konstanz, Germany

The electronic and structural properties of ultrathin epitaxial aluminum oxide layer grown on epitaxial Fe(110) films were investigated at room temperature by means of low energy electron diffraction (LEED), Auger electron spectroscopy (AES), and spin-resolved photoemission spectroscopy (PES). The determined in-plane lattice parameter of the epitaxial Al₂O₃ layers is in good agreement with that of bulk α-Al₂O₃ [1,2]. A spin polarization of P=−(15±5)% near the Fermi energy E_F is found for one monolayer of α-Al₂O₃ on epitaxial Fe(110). This value results from the attenuation of P=−80 % of the epitaxial Fe(110) underlayer by the oxide layer thickness and the spin-independent part of the scattering cross section [3].

[1] Yu. S. Dedkov et al. Appl. Phys. Lett., 81, 2584 (2002).

[2] C. N. Rao and B. Raveau in Transitional Metal Oxides (VCH, New York, 1995).

[3] H. C. Siegmann, Surf. Sci. 307-309, 1076 (1994).