Supercurrent in ferromagnetic Josephson junctions with heavy metal interlayers

Abstract

The lengthscale over which supercurrent from conventional BCS, $s$-wave, superconductors ($S$) can penetrate an adjacent ferromagnetic ($F$) layer depends on the ability to convert singlet Cooper pairs into triplet Cooper pairs. Spin aligned triplet Cooper pairs are not dephased by the ferromagnetic exchange interaction, and can thus penetrate an $F$ layer over much longer distances than singlet Cooper pairs. These triplet Cooper pairs carry a dissipationless spin current and are the fundamental building block for the fledgling field of superspintronics. Singlet-triplet conversion by inhomogeneous magnetism is well established. Here, we describe an attempt to use spin orbit coupling as a new mechanism to mediate singlet-triplet conversion in $S-F-S$ Josephson junctions. We report that the addition of thin Pt spin-orbit coupling layers in our Josephson junctions significantly increases supercurrent transmission, however the decay length of the supercurrent is not found to increase. We attribute the increased supercurrent transmission to Pt acting as a buffer layer to improve the growth of the Co $F$ layer.

20 pages, 4 figures

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Cited by in corpus (31)

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• Magnetoelectric effects in Josephson junctions
• Fraunhofer response and supercurrent spin switching in black phosphorus with strain and disorder
• Superconductivity-induced change in magnetic anisotropy in epitaxial ferromagnet-superconductor hybrids with spin-orbit interaction
• Temperature-dependent spin-transport and current-induced torques in superconductor/ferromagnet heterostructures
• Tunable pure spin supercurrents and the demonstration of a superconducting spin-wave device
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• Enhanced spin-triplet pairing in magnetic junctions with s-wave superconductors
• Supercurrent in ferromagnetic Josephson junctions with heavy metal interlayers. II. Canted magnetization
• Induced Energy Gap in Finite-Sized Superconductor/Ferromagnet Hybrids
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• Odd triplet superconductivity induced by the moving condensate
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• The quasiclassical theory for interfaces with spin--orbit coupling
• Quasiclassical boundary conditions for spin-orbit coupled interfaces with spin-charge conversion
• Pt and CoB trilayer Josephson $\pi$ junctions with perpendicular magnetic anisotropy
• Signatures of superconducting triplet pairing in Ni--Ga-bilayer junctions
• Quasiparticle conductance in Spin Valve Josephson Structures
• The physics of superconductor-ferromagnet hybrid structures
• Long-Range Superconducting Proximity Effect in Nickel Nanowires
• Upper critical fields in normal metal-superconductor-normal metal trilayers
• Reduced decay in Josephson coupling across ferromagnetic junctions with spin-orbit coupling layers
• The unusual distribution of spin-triplet supercurrents in disk-shaped Josephson junctions