Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Postersession I

DS 36.8: Poster

Mittwoch, 22. März 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 Smekhova^1,2, Thomas Szyjka¹, Rantej Bali³, Katharina Ollefs^1,4, 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 L_2,3- 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