American Physical Society Acta Medica Okayama 2469-9950 96 2 2017 Spin pumping into superconductors: A new probe of spin dynamics in a superconducting thin film 024414 EN Masashi Inoue Department of Physics, Okayama University Masanori Ichioka Research Institute for Interdisciplinary Science, Okayama University Hiroto Adachi Research Institute for Interdisciplinary Science, Okayama University Spin pumping refers to the microwave-driven spin current injection from a ferromagnet into the adjacent target material. We theoretically investigate the spin pumping into superconductors by fully taking account of impurity spin-orbit scattering that is indispensable to describe diffusive spin transport with finite spin diffusion length. We calculate temperature dependence of the spin pumping signal and show that a pronounced coherence peak appears immediately below the superconducting transition temperature Tc, which survives even in the presence of the spin-orbit scattering. The phenomenon provides us with a new way of studying the dynamic spin susceptibility in a superconducting thin film. This is contrasted with the nuclear magnetic resonance technique used to study a bulk superconductor. No potential conflict of interest relevant to this article was reported.