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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 15.94: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Circular magnetic dichroism in x-ray absorption of Co₂Cr_0.6Fe_0.4Al and Co₂FeSi(110) alloy films — •Michael Kallmayer¹, Horst Schneider¹, Andres Conca¹, Gerhard Jakob¹, Martin Jourdan¹, Hans-Joachim Elmers¹, Benjamin Balke², Andrei Gloskovskii², and Stefan Cramm³ — ¹Institut für Physik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany — ²Institut für Anorganische und Analytische Chemie Johannes Gutenberg-Universität, D-55099 Mainz, Germany — ³Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany

Theory predicts complete spin polarization for Co₂Cr_0.6Fe_0.4Al and Co₂FeSi. We investigated epitaxial films of these materials using x-ray circular dichroism (XMCD). Properties of the interfaces and the core of the films could be determined separately using total electron yield and transmission signals. We find a strong correlation of structural properties and the Cr moment for Co₂Cr_0.6Fe_0.4Al. Moreover the Co absorption spectra reveal an extra peak at 4 eV above the L₃ edge increasing with increasing local order, in agreement with theory. For Co₂FeSi films we could determine a decreased magnetization at both interfaces corresponding to an effective number of dead layers of 0.15 nm at the top interface an 0.55 nm at the bottom interface.