Thermal reduction of the threshold current density for current-induced domain wall motion in Tb-Co magnetic alloy wire

Yuichiro Kurokawa,Satoshi Sumi,Ryogo Yoshimura,Hiroyuki Awano

doi:10.1063/1.4979727

Abstract

We investigated the current-induced domain wall motion (CIDWM) in Pt (3 nm)/Tb0.34Co0.66 (6 nm) alloy wire at various temperatures (T). The threshold current density (Jth) for the CIDWM in the Tb-Co alloy wire was 0.85 × 1011 A/m2 at room temperature, and drastically decreased as T was increased. Particularly, at T = 343 K, Jth (= 0.13 × 1011 A/m2) was almost 7 times lower than that at room temperature. The reduction in Jth can be attributed to thermally activated creep motion and a reduction in the depinning current density. These results indicate that devices using CIDWM can be thermally assisted.

Highlights

Thermal reduction of the threshold current density for current-induced domain wall motion in Tb-Co magnetic alloy wire
Current-induced domain wall motion (CIDWM) has been paid much attention because it can be exploited for new magnetic memory and logic devices.[1,2,3]
The contributions of the spin hall effect (SHE) and Dzyaloshinskii-Moriya interaction (DMI), which are generated at heavy metal/ferromagnetic layer interfaces, to current-induced domain wall motion (CIDWM) have been reported.[15,17,18,19,20,21,22,23,24,25,26,27,28]

Summary

Introduction

Thermal reduction of the threshold current density for current-induced domain wall motion in Tb-Co magnetic alloy wire. 3. (a) Mean domain wall velocity (v) and (b) logarithm of domain wall velocity (log[10] v) in the Tb0.34Co0.66 wire at various temperatures (T ) as a function of current density (J).

Results

Conclusion