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arXiv · 2009.03196

Spin pumping in d-wave superconductor/ferromagnet hybrids

S. J. Carreira·D. Sanchez-Manzano·M. -W. Yoo·V. Rouco·A. Sander·J. Santamaría·A. Anane·J. E. Villegas
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Abstract

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 spin-pumping, 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 d-wave/F interfaces.

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S. J. Carreira, D. Sanchez-Manzano, M. -W. Yoo, V. Rouco, A. Sander, J. Santamaría, A. Anane, J. E. Villegas. 2021-11-25. Spin pumping in d-wave superconductor/ferromagnet hybrids. https://doi.org/10.1103/physrevb.104.144428

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