Current-induced coupled domain wall motions in a two-nanowire system

Abstract

In two closely spaced nanowires system, where domain walls exist in both of the nanowires, applying spin-polarized current to any of the nanowire will induce domain wall motions in the adjacent nanowire. The zero-current domain wall motion is accommodated by magnetostatic interaction between the domain walls. As the current density is increased, chirality flipping is observed in the adjacent nanowire where no current is applied. When current is applied to both nanowires, the coupled domain wall undergoes oscillatory motion. Coupling breaking is observed at a critical current density which varies in a non-linear manner with respect to the interwire spacing.

Manipulation of multiple 360o domain wall structures and its current-driven motion in a magnetic nanostripe

“…4(b), before the distance between TWs reaches the final equilibrium value, the two TWs undergoe an oscillatory motion which is similar to the motion of coupled walls in two-nanostripe system. 27,28 Fig. 4(c) shows the x-axis component M x and y-axis component M y of the local magnetization (on y = 24nm) in the final metastable state as a function of x.…”

Remote Walker breakdown and coupling breaking in parallel nanowire systems

“…We found that the interaction between two neighboring DWs that have the opposite magnetic charges is oscillatory in nature. 12,13 It is also possible to make use of the interaction to remotely drive a DW with a fixed chirality in the neighboring nanowire, without the direct application of current. 7 We showed that the remote drive technique can be extended by making use of the internal DW compression force to drive multiple DWs in the current-free nanowire.…”

Resonance in magnetostatically coupled transverse domain walls

“…1(b)] is one of the simplest manifestations of coupled DWs. Despite great interest in this particular coupling both experimentally and numerically [4,5,10], no experimental observation of the coupled mode has yet been observed.…”

“…These interactions can modify existing resonant behavior [1,2], lead to the appearance of new coupled modes [3][4][5], or result in a combination of these [6][7][8]. The coupling of DWs has also been proposed as a scheme towards increasing the output power of spin-torque oscillators [9], and will have an impact on the design of DW-logic-based devices as well.…”