Fabrication and magnetic properties of ferromagnetic Co50Fe50 nanorings

Abstract

In this paper, ferromagnetic Co 50 Fe 50 nanorings were fabricated by template-assisted sputtering deposition. The obtained Co 50 Fe 50 nanorings have a good dimensional uniformity, with outer diameter of 360 nm, width of 50 nm and thickness of 40 nm. The magnetic properties of Co 50 Fe 50 nanorings were investigated by micromagnetic simulations and vibrating sample magnetometer. We observed two parallel magnetic switching processes in the micromagnetic simulations of nanorings, the vortex formation process and onion rotation process, respectively. Quantitative analysis on the basis of experimental results indicates that 43.7% of the Co 50 Fe 50 nanorings undergo the vortex formation process and others undergo the onion rotation process.