Paving Spin-Wave Fibers in Magnonic Nanocircuits Using Spin-Orbit Torque

TL;DR

This paper introduces a micromagnetic simulation method to write strip-domain walls into curved magnetic nanowires using spin-orbit torque, enabling advanced magnonic devices like spin-wave multiplexers for spintronics.

Contribution

It presents a novel technique for imprinting domain walls in curved nanowires with spin-orbit torque, demonstrating their use as efficient spin-wave multiplexers.

Findings

Successful writing of domain walls into curved nanowires.

Y-shaped nanostructures function as effective spin-wave multiplexers.

Controlled manipulation of spin-wave propagation in nanostructures.

Abstract

Recent studies have revealed that domain walls in magnetic nanostructures can serve as compact, energy-efficient spin-wave waveguides for building magnonic devices that are considered promising candidates for overcoming the challenges and bottlenecks of today's CMOS technologies. However, imprinting long strip-domain walls into magnetic nanowires remains a challenge, especially in curved geometries. Here, through micromagnetic simulations, we present a method for writing strip-domain walls into curved magnetic nanowires using spin-orbit torque. We employ Y-shaped magnetic nanostructures as well as an S-shaped magnetic nanowire to demonstrate the injection process. In addition, we verify that the Y-shaped nanostructures that incorporate strip-domain walls can function as superior spin-wave multiplexers, and that spin-wave propagation along each conduit can be controllably manipulated. This spin-wave multiplexer based on strip-domain walls is expected to become a key signal-processing component in magnon spintronics.