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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Interplay between ferromagnetism and superconductivity in tunneling currents.

M S Grønsleth¹, J Linder, J-M Børven

¹Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway.

Physical Review Letters

|December 13, 2006

Summary

This study explores Josephson junctions in ferromagnetic superconductors, revealing how magnetism controls dissipationless charge and spin currents. Adjusting magnetization allows for precise tuning of these quantum currents.

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Area of Science:

Condensed Matter Physics
Quantum Materials

Background:

Superconductors exhibit quantum mechanical properties like zero electrical resistance.
Ferromagnetism involves materials with spontaneous magnetic ordering.
Spin-triplet superconductors are a less common type with unique spin properties.

Purpose of the Study:

Investigate tunneling currents in a system of two nonunitary ferromagnetic spin-triplet superconductors.
Explore the interplay between ferromagnetism and superconductivity in Josephson junctions.
Determine the possibility of tuning charge and spin currents via magnetization.

Main Methods:

Theoretical modeling of a Josephson junction.
Analysis of tunneling currents across an insulating barrier.
Examination of spin-triplet superconductivity in a ferromagnetic context.

Main Results:

A novel interplay between ferromagnetism and superconductivity was identified.
This interplay is manifested in the Josephson effect.
Dissipationless currents of charge and spin can be tuned by adjusting magnetization.

Conclusions:

The Josephson effect in this system demonstrates a unique coupling between magnetic and superconducting orders.
The ability to tune charge and spin currents offers potential for novel spintronic devices.
This research provides a pathway for controlling quantum currents through magnetic manipulation.