Generation of pure superconducting spin current in magnetic heterostructures via non-locally induced magnetism due to Landau Fermi-liquid effects

Abstract

We propose a mechanism for the generation of pure superconducting spin-current carried by equal-spin triplet Cooper pairs in a superconductor (S) sandwiched between a ferromagnet (F) and a normal metal (N${}_{\mathrm{so}}$) with intrinsic spin-orbit coupling. We show that in the presence of Landau Fermi-liquid interactions the superconducting proximity effect can induce non-locally a ferromagnetic exchange field in the normal layer, which disappears above the superconducting transition temperature of the structure. The internal Landau Fermi-liquid exchange field leads to the onset of a spin supercurrent associated with the generation of long-range spin-triplet superconducting correlations in the trilayer. We demonstrate that the magnitude of the spin supercurrent as well as the induced magnetic order in the N${}_{\mathrm{so}}$ layer depends critically on the superconducting proximity effect between the S layer and the F and N${}_{\mathrm{so}}$ layers and the magnitude of the relevant Landau Fermi-liquid interaction parameter. We investigate the effect of spin flip processes on this mechanism. Our results demonstrate the crucial role of Landau Fermi-liquid interaction in combination with spin-orbit coupling for the creation of spin supercurrent in superconducting spintronics, and give a possible explanation of a recent experiment utilizing spin-pumping via ferromagnetic resonance [Jeon $et$ $al.$, Nat. Mat. $17$, 499 (2018)].

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Cited by in corpus (24)

• Boosting spintronics with superconductivity
• Spin-transport in superconductors
• Abrikosov vortex nucleation and its detrimental effect on superconducting spin pumping in Pt/Nb/Ni80Fe20/Nb/Pt proximity structures
• Tunable pure spin supercurrents and the demonstration of a superconducting spin-wave device
• Universal spin superconducting diode effect from spin-orbit coupling
• Enhanced spin-triplet pairing in magnetic junctions with s-wave superconductors
• Supercurrent in ferromagnetic Josephson junctions with heavy metal interlayers. II. Canted magnetization
• Odd triplet superconductivity induced by the moving condensate
• Skew Andreev reflection in ferromagnet/superconductor junctions
• Long-ranged triplet supercurrent in a single in-plane ferromagnet with spin-orbit coupled contacts to superconductors
• Dynamics of two ferromagnetic insulators coupled by superconducting spin current
• Spin pumping between noncollinear ferromagnetic insulators through thin superconductors
• Generating superconducting vortices via spin-orbit coupling
• Spin phase regulated spin Josephson supercurrent in topological superconductor
• Controlling spin supercurrents via nonequilibrium spin injection
• Spin Transport in Normal Metal-Ising Superconductor Junction
• Spin current injection via equal-spin Cooper pairs in ferromagnet/superconductor heterostructures
• Tunable critical field in Rashba superconductor thin-films
• Expanding the operational temperature window of a superconducting spin valve
• Spin Hall effect generated by fluctuating vortices in type-II superconductors
• Reconstruction of the DOS at the end of a S/F bilayer
• Upper critical fields in normal metal-superconductor-normal metal trilayers
• Gauging away the Stoner model: Engineering unconventional metallic ferromagnetism with artificial gauge fields
• AC/DC spin current in ferromagnet/superconductor/normal metal trilayer systems