Superconductivity-enhanced spin pumping: Role of Andreev resonances

Abstract

We describe a simple hybrid superconductor$|$ferromagnetic-insulator structure manifesting spin-resolved Andreev bound states in which dynamic magnetization is employed to probe spin related physics. We show that, at low bias and below $T_c$, the transfer of spin angular momentum pumped by an externally driven ferromagnetic insulator is greatly affected by the formation of spin-resolved Andreev bound states. Our results indicate that these bound states capture the essential physics of condensate-facilitated spin flow. For finite thicknesses of the superconducting layer, comparable to the coherence length, resonant Andreev bound states render highly transmitting subgap spin transport channels. We point out that the resonant enhancement of the subgap transport channels establishes a prototype Fabry-Pérot resonator for spin pumping.

References in corpus (6)

• Extremely long quasiparticle spin lifetimes in superconducting aluminium using MgO tunnel spin injectors
• Relating Andreev Bound States and Supercurrents in Hybrid Josephson Junctions
• Manipulation with Andreev states in spin active mesoscopic Josephson junctions
• Tunable pure spin supercurrents and the demonstration of a superconducting spin-wave device
• Large enhancement of spin pumping due to the surface bound states in normal metal/superconductor structures
• Nonlocal conductance via overlapping Andreev bound states in ferromagnet-superconductor heterostructures

Cited by in corpus (6)

• Magnon spin current induced by triplet Cooper pair supercurrents
• Superconductor-ferromagnet hybrids for non-reciprocal electronics and detectors
• Superconductivity provides a giant enhancement to the spin battery effect
• Spin-pumping from a ferromagnetic insulator to an unconventional superconductor with interfacial Andreev bound-states
• Magnonic spin Joule heating and rectification effects
• Giant oscillatory Gilbert damping in superconductor/ferromagnet/superconductor junctions