Micromagnetic Simulation of Ferromagnetic Resonance in Nanoparticle with Lateral Gradient Magnetization

Abstract

Micromagnetic simulation is performed on a ferromagnetic nanoparticle with lateral gradient magnetization in order to study its resonance modes and magnetizaiton dynamics mechenism under microwave frequency. The ferromagnetic resonance spectra and magnetzation reversal are calculated with dc magnetic field from 0 to 600 mT. The simulations show that an obvious border spin wave resnonace mode arises under a greater magnetic external field, which provide a new method to excite spin wave in magnonics; the hard phase determines the process of dynamical magnetization reversal under microwave frequency, which is different from the static magnetization reversal where the soft phase plays a key role.