Research elucidates the effect of disorder on magnetic vortex gyration: In thin disks of magnetic material, the magnetization finds its ground state configuration to be a vortex; i.e., the magnetization is parallel to the edges of the disc rotating around a central core. When the magnetization is excited, the core of the vortex gyrates around the center of the disk.
Since this motion is relatively easy to measure, it has been the subject of substantial recent attention; in particular, recent measurements have studied the effect of disorder in the disk on this motion.
As described in their recent publication in Physical Review B, the CNST researchers find only small disorder-induced changes in the effective damping in vortex gyration and then only for small amplitude precession when the vortex core is pinned by the disorder potential.
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