Reversal of Domain Wall Motion in Perpendicular Magnetized Tb-Fe-Co Nanowires

Author

Bang Do ; Awano, Hiromitsu

Author_Institution

Toyota Technol. Inst., Nagoya, Japan

Volume

49

Issue

7

fYear

2013

fDate

Jul-13

Firstpage

4390

Lastpage

4393

Abstract

We studied the motion of magnetic domain walls (DWs) in SiO₂/TbFeCo/Pt (asymmetric) and Pt/TbFeCo/Pt (symmetric) nanowires. The reversed DW motion was observed in the asymmetric wire at zero field and room temperature. The reversed DW motion was attributed to the structural inversion asymmetry-induced spin-orbit torques from Pt/TbFeCo interface and Pt layer of the asymmetric wire. The DW velocity sign was again reversed when the current density is larger than 1.52 × 10¹¹ A/m² which corresponds to threshold of Walker-breakdown current density.

Keywords

cobalt alloys; current density; ferrimagnetic materials; interface magnetism; iron alloys; magnetic anisotropy; magnetic domain walls; magnetic thin films; nanowires; platinum; silicon compounds; spin-orbit interactions; terbium alloys; torque; Pt-TbFeCo-Pt; SiO₂-TbFeCo-Pt; Walker-breakdown current density; domain wall velocity; magnetic domain wall motion; perpendicular magnetized nanowires; structural inversion asymmetry-induced spin-orbit torques; temperature 293 K to 298 K; Current density; Magnetic domain walls; Magnetic domains; Perpendicular magnetic anisotropy; Saturation magnetization; Wires; Domain wall motion; Tb-Fe-Co; perpendicular magnetic anisotropy; spin-Hall effect; spin-transfer torque;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2252003

Filename

6559258