Current-driven spring-like oscillatory motion of coupled vortex walls in a two-nanostripe system

Abstract

In a two closely spaced nanostripes system, the coupled vortex wall undergoes a spring-like oscillatory motion (SOM) when current is applied to both nanostripes in opposite directions. The SOM may vanish, when the current density is larger than a critical value. The critical current density for destroying the SOM decreases as the interstripe spacing increases. However, as the perpendicular anisotropy of the system increases, the critical current density firstly decreases and then increases. Two competitive effects of the perpendicular anisotropy on the SOM are shown. Moreover, diagrams of without oscillation, spring behavior and motionless phases upon the current and the interstripe spacing (or the perpendicular anisotropy) are given.

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.…”

On the Effect of Magnetostatic Interaction on the Collective Motion of Vortex Domain Walls in a Pair of Nanostripes

“…In such an approximation, the energy is expressed via complex integrals (see, for example, ref. ), but near the equilibrium, the energy is quadratic with respect to the wall coordinates . The results important for application are often obtained using computer simulation …”

“…It can be seen that Equation is qualitatively consistent with the data numerically calculated using Equation and agrees satisfactorily with the results reported in refs. for a single stripe. Near the minima, good quantitative agreement is observed.…”

“…Obviously, the motion of DWs with such complex configurations is accompanied by intriguing effects and attracts attention of researchers. In particular, several modes of VW motion under the action of a dc field or spin‐polarized current of different values were found and fairly well‐studied . Interestingly, the vortex structure underlies the cyclic wall motion with displacements, i.e., the drift.…”

Движение Взаимодействующих Магнитных Вихрей В Параллельных Нанолентах

“…Естественно, что характер движения стенок со столь сложными конфигурациями содержит необычные эффекты и вызывает интерес исследователей. В частности, были обнаружены и сейчас уже достаточно хорошо изучены несколько режимов движения стенок с вихревой структурой под действием статического поля (или спин-поляризованного тока) в зависимости от его величины [15][16][17][18][19][20]. Интересно, что наличие вихревой структуры обуславливает существование циклического движения стенки со смещением -дрейфа.…”