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Using nonintrusive imaging techniques we have directly observed the nanoscopic details of the magnetization configurations of epitaxial and polycrystalline mesoscopic ring structures with a <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 state with a complete vortex core present in the ring. © 2003 The American Physical Society.

Original publication

DOI

10.1103/PhysRevB.68.134426

Type

Journal article

Journal

Physical Review B - Condensed Matter and Materials Physics

Publication Date

01/01/2003

Volume

68