Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 91: [MA] Poster II

O 91.18: Poster

Freitag, 30. März 2012, 11:00–14:00, Poster A

Magnetic and structural properties of Fe_1−xTb_x and Fe_0.82−xCo_0.18Tb_x thin films — •Birgit Hebler¹, Christian Schubert¹, Herbert Schletter¹, Florin Radu², Andreas Liebig¹, and Manfred Albrecht¹ — ¹Institute of Physics, Chemnitz University of Technology, D-09107 Chemnitz, Germany — ²Hemholtz-Zentrum Berlin für Materialen und Energie, Albert-Einstein-Str.15, D-12489 Berlin, Germany

Amorphous rare earth-transition metal alloys with perpendicular magnetic anisotropy exhibit a versatile magnetic configuration making them interesting materials for exchange coupled heterostructures used in spintronic devices. We present an investigation of Fe_1−xTb_x and Fe_0.82−xCo_0.18Tb_x thin films with a varying content of terbium (16 at. % < x < 30 at. %). The 20 nm thin films were prepared by magnetron co-sputtering in a UHV-chamber at room temperature. X-ray diffraction measurements and transmission electron microscopy imaging in cross-section geometry show an interdiffusion of the platinum protecting layers into the amorphous films at the interface. The temperature dependence of the magnetization reversal process was obtained by SQUID-VSM measurements in a maximum applied field of 7 T from 4 K to 400 K. Around the compensation temperature an anomalous reversal behavior was observed at higher fields, which may be assigned to a spin flop transition in the sperimagnetic configuration.