Micromagnetic analysis of current-induced domain wall motion in a bilayer nanowire with synthetic antiferromagnetic coupling

Takashi Komine,Tomosuke Aono

doi:10.1063/1.4944769

Takashi Komine, Tomosuke Aono

Open Access

https://doi.org/10.1063/1.4944769

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Journal: AIP Advances	Publication Date: Mar 21, 2016
Citations: 4	License type: CC BY 3.0

Affiliation: Ibaraki University, Hitachi (Japan)

Abstract

We demonstrate current-induced domain wall motion in bilayer nanowire with synthetic antiferromagnetic (SAF) coupling by modeling two body problems for motion equations of domain wall. The influence of interlayer exchange coupling and magnetostatic interactions on current-induced domain wall motion in SAF nanowires was also investigated. By assuming the rigid wall model for translational motion, the interlayer exchange coupling and the magnetostatic interaction between walls and domains in SAF nanowires enhances domain wall speed without any spin-orbit-torque. The enhancement of domain wall speed was discussed by energy distribution as a function of wall angle configuration in bilayer nanowires.

Highlights

Direct operation of magnetic domain by spin-polarized current has attracted much attention.[1,2,3] Low energy consumption in magnetic memories and logic devices are one of significant issues
We demonstrate current-induced domain wall motion in bilayer nanowire with synthetic antiferromagnetic (SAF) coupling by modeling two body problems for motion equations of domain wall
We demonstrated current-induced domain wall motion in SAF-NWs as a two-body problem of interacted domain walls, and discussed the effect of in-plane magnetic field on current-induced domain wall in SAF-NWs

Summary

INTRODUCTION

Direct operation of magnetic domain by spin-polarized current has attracted much attention.[1,2,3] Low energy consumption in magnetic memories and logic devices are one of significant issues. High speed operation is one of serious issues for practical use. Many authors reported that the spin-orbit-torque (SOT), such as Rashba effect (RE), spin Hall effect (SHE), and Dzyaloshinskii-Moriya interaction, enhances domain wall speed.[4,5,6] These effect correspond to the in-plane component of effective magnetic fields induced by drive current or structural inversion asymmetry. Influences of exchange coupling and magnetostatic interactions on wall motion mode in SAF-NWs have not been discussed yet in detail. We demonstrated current-induced domain wall motion in SAF-NWs as a two-body problem of interacted domain walls, and discussed the effect of in-plane magnetic field on current-induced domain wall in SAF-NWs

METHOD

RESULTS AND DISCUSSION

CONCLUSION