Hamburg 2001 – wissenschaftliches Programm
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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 9.90: Poster
Dienstag, 27. März 2001, 14:45–19:00, Foyer S 3
Structure and magnetic properties of [Fe(1ML)/Pt(1ML)] epitaxial superlattices on GaAs(001) — •E. Schuster, M. Doi, and W. Keune — Laboratorium für Angewandte Physik, Gerhard-Mercator-Universität Duisburg, 47048 Duisburg
Perpendicularly magnetized thin films on semiconductors are interesting for applications. We have prepared epitaxial [Fe(1ML)/Pt(1ML)]n superlattices on GaAs(001) by the MBE method. A clean (4x6) superstructure of the GaAs(001) surface was observed by RHEED, LEED and AES after Ar sputtering at 600∘C. RHEED demonstrated epitaxial growth of [Fe(1ML)/Pt(1ML)]n on a Fe(4.3Å)-seeded Pt(60Å) buffer layer. Oscillating behavior of the in-plane atomic distance was observed during the growth of the multilayer by RHEED intensity profile analysis. The L10-type layer structure was also confirmed by X-ray diffraction. Magnetic properties were investigated by conversion electron Mössbauer spectroscopy(CEMS). Although the CEMS spectra showed a rather large linewidth that indicates some atomic disorder, clear perpendicular magnetization was confirmed at room temperature. The spectrum was analyzed by a single magnetic phase using a distribution of hyperfine fields, isomer shifts and quadrupole splittings. Spectral analysis yields an average hyperfine field of 28T and an average tilting angle of the magnetic moments of ∼ 25∘ relative to the surface normal. Annealing effects for this superlattice also will be discussed.
Gefördert durch DFG/SFB491.