Tunable conductance of magnetic nanowires with structured domain walls

TL;DR

This paper demonstrates how quantum interference in magnetic nanowires with double domain walls can be tuned to control conductance and spin density, offering potential applications in spintronic devices.

Contribution

It introduces a method to manipulate conductance via resonance tuning of localized states between domain walls in magnetic nanowires.

Findings

Resonance peaks in conductance can be achieved by varying domain wall separation.

Localized quasistationary states are spin-split and mainly between the domain walls.

The effect enables control over spin density near domain walls.

Abstract

We show that in a magnetic nanowire with double magnetic domain walls, quantum interference results in spin-split quasistationary states localized mainly between the domain walls. Spin-flip-assisted transmission through the domain structure increases strongly when these size-quantized states are tuned on resonance with the Fermi energy, e.g. upon varying the distance between the domain walls which results in resonance-type peaks of the wire conductance. This novel phenomena is shown to be utilizable to manipulate the spin density in the domain vicinity. The domain walls parameters are readily controllable and the predicted effect is hence exploitable in spintronic devices.