发表机构
Technical University of Munich; Center for Quantum Engineering (ZQE), Technical University of Munich; Okayama University（慕尼黑工业大学; 慕尼黑工业大学量子工程中心; 冈山大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究通过自旋泵浦实验发现Py/Nb异质结构中超导转变附近磁阻尼异常增强，归因于可移动Abrikosov涡旋提供的额外角动量耗散通道，并展示了铁磁共振作为超导涡旋动力学灵敏探针的潜力。
AI 中文摘要
自旋泵浦进入超导体通常预期在临界温度 $T_\ extrm{c}$ 以下效率会降低，因为准粒子输运被冻结。这里我们报告了在Py/Nb异质结构中，自旋泵浦诱导的磁阻尼在超导转变后紧邻的窄温度区间内显著增强。该阻尼超过其正常态值，因此无法用传统的自旋输运准粒子图像解释。增强与Nb层的有限电阻涡旋蠕变区相吻合，并在冷却到钉扎涡旋态时消失，表明可移动的Abrikosov涡旋为自旋角动量耗散提供了额外通道。这些结果确立了铁磁共振作为超导体中耗散涡旋动力学灵敏探针的地位。
英文摘要
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.
