Information processing in patterned magnetic nanostructures with edge spin waves

Antonio Lara,Farkhad G Aliev,Javier Robledo Moreno,Konstantin Y Guslienko

doi:10.1038/s41598-017-05737-8

Abstract

Low dissipation data processing with spins is one of the promising directions for future information and communication technologies. Despite a significant progress, the available magnonic devices are not broadband yet and have restricted capabilities to redirect spin waves. Here we propose a breakthrough approach to spin wave manipulation in patterned magnetic nanostructures with unmatched characteristics, which exploits a spin wave analogue to edge waves propagating along a water-wall boundary. Using theory, micromagnetic simulations and experiment we investigate spin waves propagating along the edges in magnetic structures, under an in-plane DC magnetic field inclined with respect to the edge. The proposed edge spin waves overcome important challenges faced by previous technologies such as the manipulation of the spin wave propagation direction, and they substantially improve the capability of transmitting information at frequencies exceeding 10 GHz. The concept of the edge spin waves allows to design a broad of logic devices such as splitters, interferometers, or edge spin wave transistors with unprecedented characteristics and a potentially strong impact on information technologies.

Highlights

There has been an increasing interest in the use of spin waves for information transmission and processing[1,2,3,4,5,6]
In the following we describe results on numerical experiments which support the possibility to excite, redirect and operate E-spin waves (SWs) and to fabricate edge spin waves (E-SWs) magnonics devices
We have introduced a slit between two triangles to show that only E-SWs contribute to the backwards interference process

Summary

Introduction

There has been an increasing interest in the use of spin waves for information transmission and processing[1,2,3,4,5,6]. The basic building blocks for SW transmission, redirection and control have consisted in straight or curved ferromagnetic strips[11, 13, 14] Such elements transmit information via SW modes which have a restricted frequency range (typically below 10 GHz) and are essentially suppressed after changing the direction of propagation up to 90 degrees or by increasing the drive frequency[11, 13, 14]. Besides the broadband character (with the capability to process information at frequencies above 10 GHz) E-SWs (i) can split comparing to the conventional spin waves, (ii) could be redirected at angles up to 120 degrees and (iii) show interference phenomena providing the possibility to create phase controlled nanoscale microwave emitters

Methods

Results

Conclusion