Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 14: Magnetic Thin Films II
MA 14.3: Vortrag
Dienstag, 28. März 2006, 10:45–11:00, HSZ 03
Magnetism and Phonons at Fe/InAs(001) Interfaces — •R. Peters1, W. Keune1, E. Schuster1, K. Westerholt2, W. Sturhahn3, T. S. Toellner3, J. Zhao3, E. E. Alp3, S. Kashiwada4, and K. Yoh4 — 1Applied Physics, University of Duisburg-Essen, 47048 Duisburg, Germany — 2Experimentalphysik, Ruhr-Universität-Bochum, 44780 Bochum, Germany — 3APS, Argonne National Laboratory, Argonne, IL 60439 , USA — 4RCIQE, Hokkaido University, Sapporo 060-8628, Japan
Fe/InAs(001) is a potential candidate for electron spin injection [1]. The properties of the interface play a decisive role. By MBE growth of an isotopically enriched 57Fe(4 ML) probe layer in the Fe layer at different distances from the Fe/InAs interface and by employing Mössbauer spectroscopy (CEMS) and nuclear resonant inelastic X-ray scattering (NRIXS) we have probed the magnetic hyperfine field, Bhf, and the phonon density of states, g(E), respectively. Although substantial structural disorder is reflected in g(E) near the interface, the magnitude of the average Bhf (and the corresponding local moment µFe ∝ Bhf) remains high. For optical detection of spin injection at magnetic remanence in the Faraday geometry we have grown [Fe/Tb]n multilayers on p-InAs(001) with perpendicular remanent magnetization at low T, as evidenced by CEMS and SQUID magnetometry. After processing a lateral line-and-space pattern of the multilayer by Ar+ ion etching a typical Schottky-contact diode I-V characteristics was observed at 1.5 K, which is promising for spin injection. Supported by DFG (SFB 491 and GRK 277). [1] H. Ohno et al., Jpn. J. Appl. Phys. 42 (2003) L87.