A model for structural defects in nanomagnets

TL;DR

This paper introduces a model for structural point defects in nanomagnets, explaining their effects on vortex states and dynamics in thin nanodisks, with results aligning qualitatively with experimental observations.

Contribution

It provides a detailed model for defect interactions with vortex states in nanomagnets, including effects on equilibrium positions and vortex dynamics.

Findings

Model predicts vortex equilibrium shifts due to defects

Defects influence vortex gyrotropic oscillations

Results qualitatively agree with experiments

Abstract

A model for describing structural pointlike defects in nanoscaled ferromagnetic materials is presented. Its details are explicitly developed whenever interacting with a vortex-like state comprised in a thin nanodisk. Among others, our model yields results for the vortex equilibrium position under the influence of several defects along with an external magnetic field in good qualitative agreement with experiments. We also discuss how such defects may affect the vortex motion, like its gyrotropic oscillation and dynamical polarization reversal.