Current-induced multiple domain wall motion modulated by magnetic pinning in zigzag shaped nanowires

Xiaochao Zhou,Zhaocong Huang,Yuli Yin,Shuai Dong,Philipp Dürrenfeld,Wen Zhang,Ya Zhai

doi:10.1063/1.4975129

Abstract

Using micromagnetic simulation, we investigate the current-induced multiple domain wall motion (CIDWM) in zigzag nanowires with different bar angles (θ=90°, 120° and 150°). Two dynamic processes of single DWM and double DWM are found in different regimes of current density identified by two thresholds in all zigzag nanowires. The decreasing threshold current is found in the zigzag nanowires with increased bar angles, indicating the angular-dependence of the magnetic pinning. This work suggests a possibility of manipulating the single/multiple DWM in future DW devices by introducing the shape anisotropy.

Highlights

Due to the potential for the development of logic and memory devices,[1,2] the current-induced domain wall motion (CIDWM) in different metallic and semi-conductive nanostructures has become an attractive subject on fundamental research and technological interest
The 2nd DW begins to be depinned from the right bend, transforming from transversal wall (TW) to vortex wall (VW) with clockwise spin configuration, and propagates along the bar
For the current increased above the second threshold current density JT2h, 8.0×1011 Am-2 for 150◦ wire, the double DWM occurs, in which the 1st and 2nd DWs are depinned together, companied with the transformation to VW with clockwise spin configuration, and propagate along the wire all the way, leading to the similar ground state mentioned in former process

Summary

Introduction

Due to the potential for the development of logic and memory devices,[1,2] the current-induced domain wall motion (CIDWM) in different metallic and semi-conductive nanostructures has become an attractive subject on fundamental research and technological interest. For the current increased above the second threshold current density JT2h, 8.0×1011 Am-2 for 150◦ wire, the double DWM occurs, in which the 1st and 2nd DWs are depinned together, companied with the transformation to VW with clockwise spin configuration, and propagate along the wire all the way, leading to the similar ground state mentioned in former process.

Results

Conclusion