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AM: Magnetismus

AM 9: Poster: Magnetowid. (1-17), Dü. Schichten (18-34), Oberfl
ächenmag. (35,36), Mikr. Methoden (37-45), Mikromag. (46-58), Phasenüberg. (59-77), Spektroskop. (78-91), Nanokr.Mat.(92-96), Anisotrop. (97-101), Schmelzen(102-104),Sonst/postdeadl.(105-109)

AM 9.20: Poster

Dienstag, 27. März 2001, 14:45–19:00, Foyer S 3

Magnetic and structural properties of epitaxial Fe thin films on GaAs(001) and interfaces — •M. Doi¹, B. Roldán Cuenya¹, W. Keune¹, T. Schmitte², A. Nefedov², H. Zabel², D. Spoddig³, R. Meckenstock³, and J. Pelzl³ — ¹Lab. f. Angew. Physik, Gerhard-Mercator-Universität Duisburg,47048 Duisburg — ²Lab. f. Exp./Festkörperphysik, Ruhr-Universität Bochum,44780 Bochum — ³Inst. f. Exp. Physik, Ruhr-Universität Bochum,44780 Bochum

Fe(001) thin films(77Å) with a ⁵⁷Fe(7.2Å) probe layer at the interface were epitaxially grown on Ar sputtered GaAs(001) substrates at several temperatures (Ts=-125^∘C,50^∘C,250^∘C). The clean Ga terminated (4×6) superstructure of the GaAs(001) surface was confirmed by RHEED, LEED and AES. From RHEED profile analysis, ⁵⁷Fe and natural Fe showed epitaxial 3D-type growth on this (4×6) surface and an enlarged in-plane atomic distance of Fe was observed at the interface. The Fe films were coated by Sn(40Å) for the investigation by ex-situ x-ray diffraction, longitudinal MOKE, Mössbauer spectroscopy(CEMS) and FMR. MOKE measurements show a strong 2-fold in-plane anisotropy with the easy axis along [110] superimposed to the 4-fold easy axes of bcc-Fe, and Hc≈ 10Oe. CEMS reveals no magnetically dead layer at the Fe/GaAs interface below Ts=50^∘C. By contrast, 250^∘C growth shows magnetically dead layers suggesting alloy formation at the interface. FMR at 9.323GHz gives narrow resonance lines(△ B=2mT) with B_eff=1.90T, K₁/M=19.4mT and K_u/M=11.2mT. Gefördert durch DFG/GRK 277/SFB491