Micromagnetic simulation of nanomagnets with geometry-tuned domain wall nucleation

Abstract

Abstract. In this work we show the feasibility of tuning the domain wall nucleation by changing the geometry of nanomagnets using shadowing effects. Therefore, micromagnetic simulations based on a three-dimensional model of the nanomagnetic structures have been performed. Atomic force microscopy and anisotropy measurements on fabricated Co/Ptnanomagnets are used to calibrate the model. It is shown that an increasing gradient due to shadowing effects decreases the switching field of the nanomagnets. By varying the nanomagnet geometry, the switching field can be further decreased and the spot of nucleation can be controlled making these technique feasible for the use in nanomagnetic logic circuitry.