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Article Dans Une Revue Physical Review B Année : 2021

Spin pumping in d -wave superconductor-ferromagnet hybrids

Résumé

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

hal-03448503 , version 1 (18-11-2022)

Identifiants

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S. Carreira, D. Sanchez-Manzano, M.-W. Yoo, K. Seurre, V. Rouco, et al.. Spin pumping in d -wave superconductor-ferromagnet hybrids. Physical Review B, 2021, 104 (14), ⟨10.1103/PhysRevB.104.144428⟩. ⟨hal-03448503⟩
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