Current-driven spring-like oscillatory motion of coupled vortex walls in a two-nanostripe system
College of Physics Science and Technology, Yangzhou University - Yangzhou 225002, PRC
Received: 11 April 2013
Accepted: 14 September 2013
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.
PACS: 75.60.Ch – Domain walls and domain structure / 72.25.Pn – Current-driven spin pumping / 75.78.Cd – Micromagnetic simulations
© EPLA, 2013