Wire Width Dependence of Threshold Current Density for Domain Wall Motion in Co/Ni Nanowires

Author

Koyama, Tomofumi ; Chiba, D. ; Ueda, Kazunori ; Tanigawa, H. ; Fukami, Shunsuke ; Suzuki, Takumi ; Ohshima, Naoki ; Ishiwata, N. ; Nakatani, Yusuke ; Ono, Takahito

Author_Institution

Inst. for Chem. Res., Kyoto Univ., Kyoto, Japan

Volume

47

Issue

10

fYear

2011

Firstpage

3089

Lastpage

3091

Abstract

The authors have investigated wire width dependence of threshold current density for current-induced magnetic domain wall (DW) motion in perpendicularly magnetized Co/Ni nanowires. Threshold current density decreased with reducing the wire width, and the lowest threshold value of 1.6×10¹¹ A/m² was observed at the narrowest width of 36 nm. The micromagnetic simulation shows that the observed width dependence of threshold current density can be understood by the adiabatic spin transfer model.

Keywords

cobalt alloys; current density; ferromagnetic materials; magnetic domain walls; micromagnetics; nanomagnetics; nanowires; nickel alloys; Co-Ni; adiabatic spin transfer model; current-induced magnetic domain wall motion; micromagnetic simulation; perpendicularly magnetized Co-Ni nanowires; threshold current density; wire width dependence; Magnetic domain walls; Magnetic domains; Nanowires; Nickel; Perpendicular magnetic anisotropy; Wires; 2-D magnetic recording; 2-D neural network equalizer; Channel modeling; double-shielded reader sensitivity function; genetic algorithms;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2011.2157308

Filename

6027788