Spin Configuration and Classification of Switching Processes in Ferromagnetic Rings Down to Sub-100 nm Dimensions
C Vaz, T Monchesky, John Unguris, E Bauer, S Cherifi, S Heun, A Locatelli, L J. Heyderman, Z Cui, J Bland
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.
Journal of Magnetism and Magnetic Materials
magnetic, magnetic imagin, magnetic switching, micromagnetics, rings
, Monchesky, T.
, Unguris, J.
, Bauer, E.
, Cherifi, S.
, Heun, S.
, Locatelli, A.
, Heyderman, L.
, Cui, Z.
and Bland, J.
Spin Configuration and Classification of Switching Processes in Ferromagnetic Rings Down to Sub-100 nm Dimensions, Journal of Magnetism and Magnetic Materials
(Accessed December 6, 2023)