The magnetization reversal process of a Co/Cu/Co pseudo-spin-valve ring structure has been investigated by magneto-resistance measurements and micromagnetic simulations. Major-loop measurement reveals four distinct magnetic configurations between the top and bottom Co rings. We conducted minor-loop measurements with a fixed vortex configuration in the bottom Co ring while the magnetic state of the top Co ring was changed between the onion and vortex states. It was found that the parallel vortex between the top and bottom rings shows a stable magnetization state when the top Co ring is not fully saturated in the onion state, in which the local vortex remains at the ring edge. Micromagnetic simulations also confirm that the local vortex remaining in the top ring contributes to the control of the magnetic parallel vortex state.
ASJC Scopus subject areas
- Physics and Astronomy(all)