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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.56: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Local probe of disorder-induced magnetism in Fe60Al40 thin films by Mössbauer and X-ray spectroscopy — •Alevtina Smekhova^1,3, Dirk Walecki¹, Rantej Bali², Kay Potzger², Steffen Cornelius², Oscar Liedke², Jürgen Lindner², and Heiko Wende¹ — ¹Universität of Duisburg-Essen, Fakultät für Physik und CENIDE, Experimentalphysik, 47048 Duisburg, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institut für Ionenstrahlphysik and Materialforschung, DE - 01314 Dresden, Germany — ³Lomonosov Moscow State University, Faculty of Physics, 119991 Moscow, Russia

It is known for decades that Fe₆₀Al₄₀ system is paramagnetic at RT in the chemically ordered simple cubic B2 (CsCl) phase but exhibits ferromagnetism being chemically disordered in the A2 one [1]. This phenomenon is appealing for different applications where the delicate control of magnetic properties is needed. In Fe₆₀Al₄₀ thin films of different thicknesses chemical disorder can be induced by ion beam irradiation technique with ions possessing sufficient energy to disarray Fe and Al atoms; and nowadays it is successfully used in combination with lithography for magnetic pattern creation with a sub-50nm resolution [2]. We report on recent results of Mössbauer and element-specific X-ray spectroscopy studies of Fe₆₀Al₄₀ thin films which reveal that local environment and/or related magnetic properties strongly depend on the degree of disorder, annealing temperature and film thickness (40nm or 250nm). [1] G. Huffman et al., J.Appl. Phys. 38 (1967) 735 [2] R. Bali et al, Nano Lett. 14 (2014) 435