Figure 1: Experimental configuration.
From: Correlation between spin structure oscillations and domain wall velocities
A scanning electron micrograph of a w=500 nm wide and 30 nm thick permalloy ring with radius r=2 μm covered by a 150nm thick copper-crossed stripline overlayed with a scanning transmission X-ray microscopy (STXM) image showing the in-plane magnetic contrast. The scale bar indicates a distance of 2 μm. After saturation, the ring is in the onion state where two vortex domain walls are formed, as illustrated by a micromagnetic simulation shown in the inset in the bottom right. The angle θ between the position of the domain walls and the applied field direction is indicated. The rotating magnetic field is generated by sinusoidal current bursts with a 90° phase shift injected in the horizontal and vertical crossed stripline.
