Tailoring the vortex core in confined magnetic nanostructures

We present a study of vortex formation in interface biased nano-sized disk and square nanoelements of Fe and PyTM. For small lateral dimensions, the circular nanoelements have smaller vortex core diameter than square nanoelements with equal top surface area. For surface area ranging from 1900 nm2 to 6700  nm2, the vortex core diameter of 30 nm thick Fe (PyTM) nanoelements varies from 32 nm (36 nm) to 36 nm (48 nm). Interface effects are stronger for PyTM nanoelements.