Field- and Current-Induced Domain Wall Motion in Tb/Co Multilayers in the Presence of Spin-Orbit Coupling-Induced Torques

Author

Bang Do ; Awano, Hiromitsu

Author_Institution

Toyota Technol. Inst., Nagoya, Japan

Volume

50

Issue

11

fYear

2014

fDate

Nov. 2014

Firstpage

1

Lastpage

4

Abstract

We have studied the field- and current-induced domain wall (DW) motion in perpendicularly magnetized Tb/Co multilayer wires with asymmetric interface structures. We found that both up/down and down/up walls of a domain move at the same velocity. In the current-induced case, the DWs were moved along the current flow, not electron flow. This can be attributed to spin-orbit torques induced by structural inversion asymmetry (SIA). In addition, the DW velocity was changed by inserting ultrathin Pt interlayers into the wire stack. These results suggest that the SIA of the wire is tunable by changing layered structures.

Keywords

cobalt; magnetic domain walls; magnetic multilayers; platinum; spin-orbit interactions; terbium; velocity; Tb-Co-Pt; asymmetric interface structures; current flow; current-induced domain wall motion; electron flow; field-induced domain wall motion; multilayers; perpendicular magnetization; spin-orbit coupling-induced torques; structural inversion asymmetry; ultrathin interlayers; velocity; Current density; Magnetic domain walls; Magnetic domains; Magnetic multilayers; Perpendicular magnetic anisotropy; Wires; Domain wall (DW) motion; Tb-Co; spin-orbit coupling (SoC); spin-orbit torque (SOT);

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2328654

Filename

6971352