Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 97: Superconducting Diodes and Ratchets

TT 97.7: Vortrag

Freitag, 13. März 2026, 11:15–11:30, CHE/0089

Spin-wave-induced giant ratchet effect in superconductor-ferromagnet heterostructures — •Anton Pokusinskyi and Oleksandr Dobrovolskiy — Cryogenic Quantum Electronics, EMG and LENA, Technische Universität Braunschweig, Germany

Superconducting vortex ratchets enable directed motion of magnetic flux quanta under zero time-average forces and thus act as rectifiers in superconducting circuits. Recent diode realizations exploiting asymmetric edge barriers in superconducting NbN and V/EuS microstructures have achieved ratchet efficiencies of 35-50% [1-3]. However, their tunability remains limited by fixed geometries or magnetic-field reversal, constraining scalability and dynamic control. Here, we theoretically predict a tunable giant ratchet effect in superconductor-ferromagnet heterostructures, arising from the coupling between moving fluxons and spin waves—collective precessions of spins in the ferromagnetic layer. Our modeling, based on time-dependent Ginzburg-Landau simulations under the experimental conditions of [4], demonstrates that spin-wave excitation enables dynamic control of vortex motion, offering a pathway toward reconfigurable superconducting ratchets and fluxonic devices.
[1] Ingla-Aynes et al., Nat. Electron. 8 (2025) 411
[2] Castellani et al., Nat. Electron. 8 (2025) 417
[3] Porrati et al., Small Methods e01430 (2025)
[4] Dobrovolskiy et al., Nat. Nanotechnol. (2025).
https://doi.org/10.1038/s41565-025-02024-w.

Keywords: Ratchet effect; Abrikosov vortices; Spin waves; Superconductors; Magnonics