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
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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