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MA: Fachverband Magnetismus

MA 28: Cooperative Phenomena: Spin Structures and Magnetic Phase Transitions

MA 28.1: Vortrag

Mittwoch, 19. März 2025, 15:00–15:15, H19

Correlations of short-range environment and hyperfine parameters in disordered FeV thin-films — •Simon Rauls¹, Benedikt Eggert¹, Jürgen Fasbender², Kay Potzger², Rantej Bali², and Heiko Wende¹ — ¹Faculty of Physics and CENIDE, University of Duisburg-Essen — ²Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf

The binary alloy Fe_1−xV_x shows a variety of interesting properties, ranging from antiparallel coupling of induced V magnetic moments up to 1 µ_B per V atom to the positive vibrational entropy in the disorder/order transition from the A2 to the B2 bcc-crystalline phase. Furthermore, around equiatomic composition, the structurally complex σ-phase might develop. To understand these effects, the local atomic environment as well as both structural and chemical disorder need to be considered. Using Mössbauer spectroscopy, the local environment of ⁵⁷Fe atoms and different aspects of disorder can be investigated through careful analysis of the distribution of hyperfine parameters, i.e.. the hyperfine field splitting and the isomer shift. In this talk, the conversion electron Mössbauer spectra of the entire concentration range of Fe_1−xV_x thin film samples are presentedd. Enrichment with 95% ⁵⁷Fe results in a very high signal to noise ratio, which allows for comparison of Hesse-Rübartsch fits with a model, in which the hyperfine parameters are described by a binomial distribution of the first three nearest-neighbor shells. We acknowledge funding by the DFG through project No. 322462997.

Keywords: Magnetic Thin-films; Local structure; Mössbauer spectroscopy; Chemical and structural disorder