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PreprintCC BY 4.0arXiv

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

  • Maximilian Mangold
  • Alex Burg
  • Franz Weidenhiller
  • Thomas N. G. Meier
  • Hiroto Adachi
  • Lin Chen
  • Christian Back
Open at sourcePDFDOICite

Abstract

Spin pumping into superconductors is generally expected to become less efficient below the critical temperature Tc 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.

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Cite

BibTeXRIS
BibTeX
@misc{mangold2026spin,
  title = {{Spin pumping reveals vortex-mediated angular-momentum dissipation at the superconducting transition}},
  author = {Maximilian Mangold and Alex Burg and Franz Weidenhiller and Thomas N. G. Meier and Hiroto Adachi and Lin Chen and Christian Back},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.32947},
  eprint = {2609.32947},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.32947},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Spin pumping reveals vortex-mediated angular-momentum dissipation at the superconducting transition
AU  - Maximilian Mangold
AU  - Alex Burg
AU  - Franz Weidenhiller
AU  - Thomas N. G. Meier
AU  - Hiroto Adachi
AU  - Lin Chen
AU  - Christian Back
PY  - 2026
DA  - 2026/09/26
PB  - arXiv
DO  - 10.48550/arxiv.2609.32947
UR  - https://arxiv.org/abs/2609.32947
AB  - Spin pumping into superconductors is generally expected to become less efficient below the critical temperature T_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.
ER  -