Magnetic moment manipulation by triplet Josephson current

TL;DR

This paper investigates how the Josephson current can be used to manipulate the magnetic moment in multilayered ferromagnetic Josephson junctions, highlighting potential applications in superconducting spintronics.

Contribution

It introduces a mechanism for controlling long-range induced magnetic moments via Josephson phase tuning and voltage application in triplet superconducting junctions.

Findings

Magnetic moment depends on Josephson phase.

Voltage induces oscillatory magnetic moments.

Detection confirms triplet superconductivity.

Abstract

The induced magnetic moment, provided by the bands electrons, is calculated in a variety of Josephson junctions with multilayered ferromagnetic (F) weak link. The noncollinear magnetization of the F layers provides the conditions necessary to generate triplet superconducting correlations. It leads to the long-range induced magnetic moment, emerging in the superconducting (S) layers. It is shown to be dependent on the Josephson phase. By tuning the Josephson current, one may control the long-range induced magnetic moment. Alternatively, applying the voltage we can generate an oscillatory magnetic moment. The detection of such a spin effect may serve as independent evidence of the triplet superconductivity. The proposed mechanism seems to be attractive for superconducting spintronic devices with low dissipation.