Simultaneous control of vortex polarity and chirality in thickness-modulated [Co/Pd]n/Ti/Ni80Fe20 disks

摘要

Simultaneous vortex chirality and polarity control are observed in thickness-modulated [Co/Pd]/Ti/NiFe disks using magnetic force microscopy by applying a proper sequence of in-plane and out-of-plane reset fields. The thickness modulation in the NiFe layer introduces an additional shape anisotropy, which defines the vortex chirality during the in-plane reset field, while the [Co/Pd] underlayer produces a large out-of-plane stray field, which stabilizes the vortex polarity in the NiFe layer. Micromagnetic simulations are compared with experiment results.