Work

Spin pumping reveals vortex-mediated angular-momentum dissipation at the superconducting transition

Year: 2026

Type: preprint

Abstract: Spin pumping into superconductors is generally expected to become less efficient below the critical temperature $T_\textrm{c}$ because quasiparticle transport freezes out. Here we report a pronounced enhancement of the spin pumping-induced magnetic damping in Py/Nb heterostructures, confined to a narrow temperature interval immediately below the superconducting transition. The damping exceeds its normal-state value and therefore cannot be explained within the conventional quasiparticle picture of spin transport. The enhancement coincides with the finite-resistance vortex-creep regime of the Nb layers and disappears upon cooling into the pinned vortex state, indicating that mobile Abrikosov vortices provide an additional channel for spin-angular-momentum dissipation. These results establish ferromagnetic resonance as a sensitive probe of dissipative vortex dynamics in superconductors.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2609.32947

Authors: Mangold, Maximilian, Burg, Alex, Weidenhiller, Franz, Meier, Thomas N. G., Adachi, Hiroto, Chen, Lin, Back, Christian

Institutions: Technical University of Munich, Okayama University, Research Institute for Interdisciplinary Science, Okayama University

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W7214745260

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