Dresden 2006 – scientific programme
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MA: Magnetismus
MA 29: Magnetic Thin Films IV
MA 29.9: Talk
Thursday, March 30, 2006, 17:15–17:30, HSZ 03
Electrodeposition and magnetic properties of multilayered Fe-Pt films — •Karin Leistner, Heike Schlörb, Sebastian Fähler, and Ludwig Schultz — IFW Dresden
The L10 FePt phase exhibits a very high magnetocrystalline anisotropy and a high saturation magnetisation. These properties make FePt films suitable for micromagnets in micro electromechanical systems. There, films with thicknesses in the µm range are needed which could be economically produced by electrodeposition. Up to now homogeneous FePt films have been deposited potentiostatically. During post annealing in hydrogen, the L10 phase is formed and coercivities up to 1.1 T have been achieved [1]. However, oxygen is incorporated into the films during electrodeposition and cannot be fully removed during annealing. Oxide impurities are thus limiting the remanence. Less oxygen is incorporated when depositing the single elements. It has been shown that by alternating the deposition potential, Fe/Pt multilayers with a significantly lower oxygen content can be obtained. Annealing of these multilayers leads to complete intermixing and the formation of the L10 phase. Coercivities as high as 1 T are obtained.
[1] K. Leistner, H. Schlörb, J. Thomas, M. Weisheit, S. Fähler, L. Schultz, APL 85(16), 3498 (2004)