Spin pumping in d-wave superconductor/ferromagnet hybrids

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.

20 pages, 6 figures

References in corpus (10)

• Temperature dependence of spin diffusion length and spin Hall angle in Au and Pt
• Spin Imbalance and Spin-Charge Separation in a Mesoscopic Superconductor
• Extremely long quasiparticle spin lifetimes in superconducting aluminium using MgO tunnel spin injectors
• Spin dynamics in a superconductor / ferromagnet proximity system
• Spin injection and relaxation in a mesoscopic superconductor
• The interplay of large two-magnon ferromagnetic resonance linewidths and low Gilbert damping in Heusler thin films
• Abrikosov vortex nucleation and its detrimental effect on superconducting spin pumping in Pt/Nb/Ni80Fe20/Nb/Pt proximity structures
• Temperature-dependent spin-transport and current-induced torques in superconductor/ferromagnet heterostructures
• Large enhancement of spin pumping due to the surface bound states in normal metal/superconductor structures
• Domain - wall - induced magnetoresistance in pseudo spin-valve/superconductor hybrid structures

Cited by in corpus (5)

• Anisotropic superconducting spin transport at magnetic interfaces
• Ferromagnetic resonance modulation in $d$-wave superconductor/ferromagnetic insulator bilayer systems
• Spin-pumping from a ferromagnetic insulator to an unconventional superconductor with interfacial Andreev bound-states
• Anisotropic spin-current spectroscopy of ferromagnetic superconducting gap symmetries
• Spin Pumping into two-dimensional systems