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|Author(s):||C Vaz; T Monchesky; John Unguris; E Bauer; S Cherifi; S Heun; A Locatelli; L J. Heyderman; Z Cui; J Bland;|
|Title:||Spin Configuration and Classification of Switching Processes in Ferromagnetic Rings Down to Sub-100 nm Dimensions|
|Published:||May 01, 2004|
|Abstract:||The magnetic states and switching processes are investigated in Co and NiFe rings with lateral dimensions from the micrometer range down to sub-100 nm. 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. It is found that the double switching can be retained in sub-100 nm rings by tailoring the material and thickness.|
|Citation:||Journal of Magnetism and Magnetic Materials|
|Pages:||pp. 1631 - 1636|
|Keywords:||magnetic,magnetic imagin,magnetic switching,micromagnetics,rings|