Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.23: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Magnetic anisotropy in ultrathin Pd,Au/Fe bilayers on GaAs(001) — Oleksander Mosendz1, Jan Zukrowski2, Bartek Kardasz1, Bret Heinrich1, •Marek Przybylski3, and Jurgen Kirschner3 — 1Simon Fraser University, Vancouver, Canada — 2AGH University of Science and Technology, Krakow, Poland — 3Max-Planck-Institut fur Mikrostrukturphysik, Halle, Germany
The role of the deposition technique on the magnetic anisotropies in Fe/GaAs(001) based structures was investigated by ferromagnetic resonance (FMR) and conversion electron Mössbauer spectroscopy (CEMS). The Fe layers were prepared by thermal deposition (TD) or by pulsed laser deposition (PLD) techniques. For CEMS experiments, the 57Fe probe layer was placed either in the Fe/GaAs(001) interface, in the interface with the Au or Pd coating layers, or at various depth of the films. To assure film continuity and a Curie temperature well above room temperature (RT), the total film thickness was kept around 10 ML of Fe. CEMS spectra, measured ex situ at RT, show that TD samples have a better interface lattice structure than those deposited by means of PLD. Further, diffusion of As into the film volume is detected from the spectra. Interestingly, even the upper interface is affected by the deposition technique due to As floating on top of the Fe film. It is shown that perpendicular anisotropy is mostly increased at the Fe/Au(001) interface, and becomes maximum for the PLD-grown Fe films. PLD also increases the magnetic damping which is caused by two magnon scattering.