Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 7: Diffusion II
MM 7.4: Vortrag
Montag, 25. Februar 2008, 12:45–13:00, H 0111
Re-orientation behaviour of c-variant FePt thin films — •Marcus Rennhofer1, Miroslav Kozlowski2, Bart Laenens3, Bogdan Sepiol1, Rafal Kozubski2, Andre Vantomme3, Johan Meersschaut3, and Gero Vogl1 — 1University of Vienna, Vienna, Austria — 2Jagiellonian University Cracow, Cracow, Poland — 3Instituut for Kern- en Stralingsfysika
The magnetocrystalline and thermal stability of L10-FePt makes this alloy suitable for ultrahigh density recording. Various experiments with bulk L10-FePt dealing with diffusion and ordering dynamics have been performed [1, 2].
Our Monte Carlo (MC) simulations show that the c-variant of the L10 superstructure (easy axis of the magnetisation out of plane of the thin film samples) is unstable. The monoatomic planes re-orient creating a-domains (easy axis of the magnetic field in the film plane). Our recent conversion electron Mössbauer spectroscopy (CEMS) experiments on -variant 57FePt(50 nm)/MgO(001) thin films show evidence of this re-orientation behaviour. The picture arising from our results is as follows: an re-orientation takes place but reverts after a certain time and then saturates. The effect depends on the annealing temperature. An additional capping of the films suppresses the effect almost completely.
[1] M. Rennhofer et al. Phys. Rev. B. 74(10), 104301 (2006).
R. Kozubski et al J. of Phase Equil. and Diff. 26(5), 482−486 (2005).