Spin pumping in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>d</mml:mi></mml:math> -wave superconductor-ferromagnet hybrids

Spin-pumping across ferromagnet/superconductor (F/S) interfaces has attracted much attention lately. Yet the focus been mainly on s-wave superconductors-based systems whereas (high-temperature) d-wave superconductors such as YBa2Cu3O7-d (YBCO) have received scarce despite their fundamental and technological interest. Here we use wideband ferromagnetic resonance to study spin-pumping effects in bilayers that combine a soft metallic Ni80Fe20 (Py) ferromagnet YBCO. We evaluate spin conductance YBCO by analyzing magnetization dynamics Py. find Gilbert damping exhibits drastic drop heterostructures are cooled normal-superconducting transition then, depending S/F interface morphology, either stays constant or shows strong upturn. This unique behavior is explained considering quasiparticle density of states at surface, direct consequence zero-gap nodes for particular directions momentum space. Besides showing fingerprint superconductivity spin-pumping, our results demonstrate potential high-temperature fine tuning ferromagnets using k-space degrees freedom d-wave/F interfaces.