Spin pumping in -wave superconductor-ferromagnet hybrids

Spin pumping across ferromagnet/superconductor (F/S) interfaces has attracted much attention lately, yet the focus has been mainly on -wave superconductor based systems whereas (high-temperature) -wave superconductors such as Y⁢Ba2⁢Cu3⁢O7−d (YBCO) have received scarce attention despite their fundame...

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Detalles Bibliográficos
Autores: Carreira, Santiago, Sanchez-Manzano, David, Yoo, M.-W., Seurre, Kevin, Rouco, V., Sander, A., Santamaría Sánchez-Barriga, Jacobo, Anane, A., Villegas, J.E.
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/114357
Acceso en línea:https://hdl.handle.net/20.500.14352/114357
Access Level:acceso abierto
Palabra clave:538.9
Quasi-particles
Andreev reflection
Charge separation
Gap
Imbalance
Symmetry
States
Física de materiales
2211.27 Superconductores
Descripción
Sumario:Spin pumping across ferromagnet/superconductor (F/S) interfaces has attracted much attention lately, yet the focus has been mainly on -wave superconductor based systems whereas (high-temperature) -wave superconductors such as Y⁢Ba2⁢Cu3⁢O7−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 Ni80⁢Fe20 (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 -wave superconductivity in spin pumping, our results demonstrate the potential of high-temperature superconductors for fine tuning of the magnetization dynamics in ferromagnets using -space degrees of freedom of -wave/F interfaces.

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