Observation of Spin Dynamics Using Atomistic Simulation

Abstract

In order to apply the nanomagnetic materials to the electronic devices, an understanding of the spin dynamics on the atomic scale length is necessary. In this thesis fundamental comprehension and certification are conducted and the several spin dynamic structures are studied using the atomistic simulation. The Curie and Neel temperature of the materials having various crystal structures are obtained from the small cube having periodic boundary conditions by the atomistic Monte Carlo simulations. The correction factors of each crystal structures are calculated from the simulation results. Another researches about fundamental understanding of the exchange bias is conducted. The atomic moments of the antiferromagnetic materials (FeO) in the bilayer junction of the ferromagnetic and the antiferromagnetic materials pointed along aligned ferromagnetic moments by the applying field. Finally, topologically protected spin structures, called as the magnetic skyrmions, formed by the antisymmetric exchange interaction, Dzyaloshinskii-Moriya (DM) interaction, is investigated. To be specific, we checked the relation between the interfacial roughness and the effective magnitude of the DM interaction determining the skyrmion area.