Spin dependent transport in ferromagnetic/superconductor/ferromagnetic single electron transistor

TL;DR

This paper investigates how spin-dependent transport affects superconductivity in ferromagnetic/superconductor/ferromagnetic single electron transistors, revealing that antiparallel magnetic configurations suppress superconductivity due to spin imbalance.

Contribution

It demonstrates the fabrication and measurement of ferromagnetic single electron transistors with orthogonal ferromagnetic leads, highlighting the impact of magnetic configuration on superconductivity.

Findings

Antiparallel magnetic configuration suppresses superconductivity.

Single electron tunneling effects are observed in I-V characteristics.

Spin imbalance influences superconducting properties.

Abstract

Ferromagnetic single electron transistors with Al islands and orthogonal ferromagnetic leads (Co) are fabricated using ebeam lithography followed by shadow evaporation techniques. I-V characteristics exhibit typical single electron tunneling effects. Transport measurements performed in external magnetic field show that, when the two ferromagnetic leads are in antiparallel configuration, spin imbalance leads to a suppression of superconductivity.