Using non-intrusive imaging techniques we have directly observed the nanoscopic details of the magnetization configurations of epitaxial and polycrystalline mesoscopic ring structures with <15 nm resolution. We have found head to head domain walls with different spin structures depending on ring width. Further, we can classify the geometry dependent switching processes according to the number of transitions (single, double, triple) that a ring undergoes in a hysteresis cycle. In the case of triple switching we find a novel state with a complete vortex core present in the ring.
Citation: Physical Review B (Condensed Matter and Materials Physics)
Pub Type: Journals
micromagnetic, nanoscale, rings, SEMPA, SPELEEM, switching, vortex