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MA: Magnetismus

MA 2: Magnetic Thin Films I

MA 2.6: Vortrag

Montag, 27. März 2006, 11:30–11:45, HSZ 03

Interface formation and its influence on magnetic anisotropy in ultrathin Fe films grown by TD and PLD on GaAs(001) — •Marek Przybylski¹, Jan Zukrowski², Bartlomiej Kardasz³, Oleksandr Mosendz³, Bretislav Heinrich³, and Jürgen Kirschner¹ — ¹Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany — ²Solid State Physics Department, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Mickiewicza 30, 30-059 Krakow, Poland — ³Simon Fraser University, Department of Physics, 8888 University Drive, Burnaby, B.C., V5A 1S6 Canada

The role of the Fe/GaAs(001) interface atomic structure on the magnetic properties of ultrathin film of Fe was investigated by using a 2 ML of ⁵⁷Fe probe layer grown on a GaAs(001) substrates by thermal deposition (TD) or by pulsed laser deposition (PLD) techniques. To assure film continuity and a Curie temperature well above room temperature (RT), the probe layer was covered with an additional 8 ML of natural Fe. Conversion electron Mössbauer spectra (CEMS) were measured ex situ at RT. A broad low-magnetic field component was clearly present in the measured Mössbauer spectrum for the PLD probe layer. Most likely this component can be attributed to a high degree of atomic intermixing at the Fe/GaAs interface. A low-field component was not detected in the case of the TD-grown ⁵⁷Fe probe layer. Ferromagnetic resonance (FMR) was used to measure the magnetic anisotropies of the studied films. It will be shown that all anisotropies were strongly affected by TD and PLD deposition techniques.