Transport Properties in Ferromagnetic Josephson Junction between Triplet Superconductors

TL;DR

This paper investigates charge and spin Josephson currents in a ballistic superconductor-ferromagnet-superconductor junction with spin-triplet pairing, analyzing how ferromagnetic layer thickness and magnetization affect current behavior and phase transitions.

Contribution

It provides a detailed analysis of how ferromagnetic layer properties influence Josephson charge and spin currents in triplet superconductor junctions, highlighting conditions for 0- transitions.

Findings

0- transition depends on the relative orientation of exchange field and d-vector.

Spin current is generated by misalignment between exchange field and d-vector.

Ferromagnetic layer thickness and magnetization magnitude significantly affect Josephson currents.

Abstract

Charge and spin Josephson currents in a ballistic superconductor-ferromagnet-superconductor junction with spin-triplet pairing symmetry are studied using the quasiclassical Eilenberger equation. The gap vector of superconductors has an arbitrary relative angle with respect to magnetization of the ferromagnetic layer. We clarify the effects of the thickness of ferromagnetic layer and magnitude of the magnetization on the Josephson charge and spin currents. We find that 0-\pi transition can occur except for the case that the exchange field and d-vector are in nearly perpendicular configuration. We also show how spin current flows due to misorientation between the exchange field and d-vector.