Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 4: Disordered Magnetic Materials
MA 4.4: Vortrag
Montag, 5. September 2022, 10:15–10:30, H47
Understanding the ion induced reordering of amorphous Fe60V40 thin films — •Simon Rauls1, Benedikt Eggert1, Shadab Anwar2, Damian Günzing1, Philipp Klaßen1, Alexander Herman1, Rantej Bali2, and Heiko Wende1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen — 2Interface Magnetism, Helmholtz-Zentrum Dresden-Rossendorf
For efficient spintronic devices, magnetic materials possessing both low moment and low Gilbert damping are highly demanded [1]. In this field, binary alloys consisting of Fe and easily polarizable elements like V are promising candidates, as they are reported to have a Gilbert damping parameter of α ∼ 0.001 which is about one order of magnitude lower as compared to the much-used permalloy [2]. Additionally, FeV can be grown as amorphous, paramagnetic thin films which reorder to the A2 structure upon ion irradiation. This can be exploited in such a way that ferromagnetic nanostructures can be written into the paramagnetic template in a single ion irradiation step using focussed ion beams or broad ion beams with masks.
Using Mössbauer spectroscopy and EXAFS, we will provide further insights into the reordering mechanics of amorphous Fe60V40 thin films by comparing the evolution of short range order and the hyperfine fields across the ion irradiation- and annealing-induced phase transition.
Funding by the Deutsche Forschungsgemeinschaft (DFG) - 322462997 (BA5656/1-2 WE 2623/14-2) is acknowledged.
[1] A. Barman et al. J. Phys.: Condens. Matter 33 413001 (2021)
[2] D. Smith et al., Phys. Rev. Applied 14, 034042 (2020)