Dipolar domain wall tuning in Fe@Py core-shell cylinders

Abstract We report a theoretical study of the impact of the dipolar interaction on the magnetic phases of Fe@Py rectangular cylindrical core-shells. Our results show that the Fe@Py core-shell geometrical parameters may be chosen to allow significant changes in magnetic phases of the isolated Fe core and Py shell. For instance, an 18 nm height rectangular (81 nm × 117 nm) and 21 nm thick Py shell inhibits the formation of the intrinsic magnetic vortex of an isolated 18 nm height (33 nm × 33 nm) square Fe core. We show that the geometric parameters of flat Fe@Py core-shell cylinders can be chosen in such a way to control the nucleation of domain walls in the Py shell. Furthermore, it allows fine-tuning the domain wall position and the domain wall width on the Py shell.