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SYMS: Symposium Three-Dimensional Nanostructures: From Magnetism to Superconductivity

SYMS 1: Three-Dimensional Nanostructures: From Magnetism to Superconductivity

SYMS 1.5: Invited Talk

Monday, March 18, 2024, 11:45–12:15, H 0105

3D nanoarchitectures for superconductivity and magnonics — •Oleksandr Dobrovolskiy — University of Vienna, Faculty of Physics, Nanomagnetism and Magnonics, SuperSpin Lab, Austria

Traditionally, the primary field, where curvature is playing a pivotal role, is the theory of general relativity. In recent years, however, the impact of curvilinear geometry attracts increasing attention in various disciplines, ranging from solid-state physics to chemistry and biology. In this talk, I will outline some current challenges associated with 3D nanoarchitectures for superconductivity and magnetism [1,2]. Two examples of ferromagnetic and superconducting systems will be considered in more detail. In the first example [3], due to strongly nonuniform demagnetizing field, by varying the crater diameter of a 3D nanovolcano, the high-frequency spin-wave eigenmodes can be tuned without affecting the lowest-frequency mode. Thereby, the extension of 2D nanodisks into the third dimension allows one to engineer their lowest eigenfrequency by using 3D nanovolcanoes with 30% smaller footprints. In the second example [4], due to the small film area in contact with the substrate, the noise-equivalent-power for a Nb 3D nanohelix microwave bolometer is about four orders of magnitude smaller than that for a commercially available sensor made from a 2D superconducting film. Therefore extending nanostructures into 3D has become a major research avenue in modern magnetism and superconductivity. [1] D. Makarov, et al. Adv. Mater. 34 (2022) 2101758. [2] V. Fomin and O. Dobrovolskiy, APL 120 (2022) 090501. [3] O. Dobrovolskiy, et al. APL 118 (2021) 132405. [4] S. Lösch, et al. ACS Nano 13 (2019) 2948.

Keywords: 3D nanoarchitectures; superconductivity; magnonics