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DS: Fachverband Dünne Schichten

DS 13: Poster

DS 13.20: Poster

Donnerstag, 20. März 2025, 18:00–20:00, P1

Martensitic Transformation in Ultrathin Layered Stacks of Fe₈₅Ni₁₅ and Fe₇₁Ni₂₉ — •Nancy Töws, Pascal Strathkötter, Roland Schubert, Inga Ennen, Judith Bünte, Laila Bondzio, Dario Stierl, and Andreas Hütten — Universität Bielefeld, Dünne Schichten und Physik der Nanostrukturen, Universitätsstr. 25, 33615 Bielefeld, Germany

Magnetic shape memory alloys, such as various Heusler alloys, have been extensively studied over the past decade for their potential in magnetocaloric applications. In the realm of thin-film technology, stacking different Heusler alloys in layered systems offers a microstructural design framework initiated through the interaction of strain fields during the martensitic transformation of the stack*s individual components*.

Here, we present results on the stacking of two well-known FeNi alloys, Fe₈₅Ni₁₅ and Fe₇₁Ni₂₉, and the resulting physical properties. We report on investigations conducted using structural, magnetic, and thermal methods, alongside findings on the progression of martensitic and austenitic transformations within these distinct layered systems.

*Reference: Ramermann et al., *Nano Scaled Checkerboards: A Long-Range Ordering in NiCoMnAl Magnetic Shape Memory Alloy Thin Films with Martensitic Intercalations,* Appl. Sci. 2022, 12(3), 1748; https://doi.org/10.3390/app12031748.

Keywords: Martensitic phase transition; Moirè pattern; FeNi