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MM: Fachverband Metall- und Materialphysik

MM 2: Topical Session Interface-Dominated Phemomena - Moving Interfaces / Functional Properties

MM 2.4: Vortrag

Montag, 27. September 2021, 12:00–12:15, H8

Nanoscale Friction Under Active Control in Systems With Tailored Degrees of Freedom — •Niklas A. Weber¹, Miru Lee², Richard L.C. Vink¹, Matthias Krüger², and Cynthia A. Volkert¹ — ¹Institut für Materialphysik, Friedrich-Hund-Platz 1, 37077 Göttingen — ²Institut für Theoretische Physik, Friedrich-Hund-Platz 1, 37077 Göttingen

In this project, we use lateral force microscopy to investigate how friction of manganite films can be controlled by the properties of the surrounding materials. Specifically, we use phase transformations [1,2] and superlattice thin film samples [3] to actively control the film properties while keeping the surfaces unchanged.
We observed an increase in friction during resistive switching of a La_0.55Ca_0.45MnO₃ film [1] and during heating of a La_xSr_1−xMnO₃ thin film through the metal-insulator phase transformation [2]. Careful consideration of the different contributions and comparison with literature lead to the conclusion that the electronic contributions are not sufficient to account for our observations and make phononic contributions a promising candidate.
To test our hypothesis, we have started to perform measurements on LaMnO₃/SrMnO₃ superlattice systems in which the propagation of phonons can be actively manipulated by the layer spacing [3], while the morphology of the surface layer remains unchanged.
[1] H. Schmidt et.al., Phys. Rev. Mater. 2020, 4, 113610.
[2] N. A. Weber et.al., Adv. Sci. 2021, 2003524.
[3] D. Meyer et al., arXiv:2009.14532v3.