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DS: Fachverband Dünne Schichten
DS 36: Postersession I
DS 36.8: Poster
Wednesday, March 22, 2017, 17:00–19:00, P2-EG
An element specific investigation of the disorder induced phase transition in Fe60Al40 thin films driven by ion irradiation — •Benedikt Eggert1, Enrico La Torre1, Alevtina Smekhova1,2, Thomas Szyjka1, Rantej Bali3, Katharina Ollefs1,4, Soma Salamon1, Fabrice Wilhelm4, Rudra Banerjee6, Andrei Rogalev4, Eugen Weschke5, Jürgen Lindner3, Biplab Sanyal6, Carolin Schmitz-Antoniak2, and Heiko Wende1 — 1University of Duisburg-Essen and CENIDE, Duisburg — 2FZ Jülich (PGI-6), Berlin — 3HZDR, Dresden — 4ESRF, ID12, Grenoble — 5HZB (BESSY II), Berlin — 6Uppsala University, Uppsala
Chemically ordered Fe60Al40 in the B2 structure shows weak ferromagnetism, while the disordered phase with the A2 structure exhibits a ferromagnetic state. Correspondingly the transition leads to an increase of the effective number of Fe-Fe nearest neighbors and of the lattice constant [1]. This phase transition can be driven by ion irradiation. In this work we investigate Fe60Al40 thin films before and after 10 and 20 keV Ne+ irradiation by means of X-ray magnetic circular dichroism (XMCD) at the Fe L2,3- and K-edge to analyze the microscopic magnetic structure. For a comparison magnetometry was used concerning the depth-profile of the induced magnetism [2,3]. These results are correlated to the modified structural properties.
[1] J. Fassbender et al. Phys. Rev. B 2008, 77, 174430
[2] R. Bali et al. Nano Lett. 2014, 14 (2), pp 435-441
[3] N. Tahir et al. Phys. Rev. B 2015, 92, 144429