Tailoring the vortex core in confined magnetic nanostructures

Abstract

We present a study of vortex formation in interface biased nano-sized disk and square nanoelements of Fe and Py TM. 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 nm 2 to 6700 nm 2 , the vortex core diameter of 30 nm thick Fe (Py TM) nanoelements varies from 32 nm (36 nm) to 36 nm (48 nm). Interface effects are stronger for Py TM nanoelements. V

Impact of core-shell dipolar interaction on magnetic phases of spherical core-shell nanoparticles

“…In order to handle a large number of magnetic moments subjected to long-range dipolar interactions, one possibility is to operate on a larger scale by regarding the particle as being composed of small units, which are nevertheless large enough to allow a continuous approximation of their magnetization. This is the basis of the micromagnetism approach [29], which has been largely used to determine the magnetic phases, such as domain walls and vortices, and reversal mechanisms of magnetic particles, with dimensions in the sub-100-nm up to micrometer range [30][31][32][33][34][35].…”