Odd triplet superconductivity in superconductor-ferromagnet structures with a narrow domain wall

Abstract

We study the proximity effect in superconductor-ferromagnet (SF) structure with a narrow domain wall (DW) at the SF interface. The width of the domain wall is assumed to be larger than the Fermi wave length, but smaller than other characteristic lengths (for example, the ''magnetic'' length). The transmission coefficient is supposed to be small so that we deal with a weak proximity effect. Solving the linearized Eilenberger equation, we find analytical expressions for quasiclassical Green's functions. These functions describe the short-range (SR) condensate components, singlet and triplet with zero projection of the total spin on the quantization z-axis, induced in F due to the proximity effect as well as long-range odd triplet component (LRTC) with a nonzero projection of the total spin of Cooper pairs on the $z$% -axis. The amplitude of the LRTC essentially depends on the product $h\tau$ and increases with increasing the exchange energy $h$ ($\tau$ is the elastic scattering time). We calculate the Josephson current in SFS junction with a thickness of the F layer much greater than the penetration length of the SR components. The Josephson critical current caused by the LRTC may be both positive and negative depending on chirality of the magnetic structure in F. The density of states (DOS) in a diffusive SF bilayer is also analyzed. It is shown that the contributions of the SR and LR components to the DOS in F have a different dependence on the thickness $d$ of the F layer (nonmonotonous and monotonous).

14 pages, 3 Figs. submitted to Phys. Rev. B

References in corpus (12)

• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Josephson effect due to the long-range odd-frequency triplet superconductivity in SFS junctions with Neel domain walls
• Induced Triplet Pairing in clean s-wave Superconductor/Ferromagnet layered structures
• Josephson coupling through ferromagnetic heterojunctions with noncollinear magnetizations
• Odd triplet superconductivity in a superconductor/ferromagnet structure with a spiral magnetic structure
• 0-pi Transitions in a Superconductor/Chiral Ferromagnet/Superconductor Junction induced by a Homogeneous Cycloidal Spiral
• Long-range odd triplet superconductivity in SF structures with Neel walls
• Josephson current and Andreev states in superconductor-half metal-superconductor heterostructures
• Anomalous double peak structure in Nb/Ni superconductor/ferromagnet tunneling DOS
• Scattering by magnetic and spin-orbit impurities and the Josephson current in superconductor-ferromagnet-superconductor junctions
• Density of states in SF bilayers with arbitrary strength of magnetic scattering
• Josephson effect in thin-film superconductor/insulator/superconductor junctions with misaligned in-plane magnetic fields

Cited by in corpus (4)

• Critical current of a Josephson junction containing a conical magnet
• Theory of superconducting and magnetic proximity effect in S$\mid$F structures with inhomogeneous magnetization textures and spin-active interfaces
• Proximity effect and its enhancement by ferromagnetism in high-temperature superconductor-ferromagnet structures
• Superconducting/ferromagnetic diffusive bilayer with a spin-active interface: a numerical study