Micromagnetic Study of the Bloch Domain Wall Motion on CoFeB Nanowires with Perpendicular Anisotropy Raditya Nugraha (a), Dede Djuhana (a*), and Candra Kurniawan(a, b)
Department of Physics, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
*dede.djuhana[at]sci.ui.ac.id
Research Center for Advanced Materials, National Reseach and Innovation Agency (BRIN), Puspiptek Office Area, Tangerang Selatan 15314, Indonesia
Abstract
In the scope of spintronic device research, ferromagnets with perpendicular magnetization anisotropy (PMA) has become popular in the past couple of decades. Despite having generally lower domain wall (DW) velocities, PMA ferromagnets have been shown to exhibit lower driving thresholds and smaller domain walls allowing for greater control over the DW itself. Numerous research and observations have previously been made regarding the dynamics of the DW on PMA ferromagnets. However, comprehensive micromagnetic studies regarding the topic are scarcely made. In this study, we conduct micromagnetic simulations of CoFeB nanowires with perpendicular anisotropy and varying thicknesses to study the dynamics of the Bloch-wall structure DW under the influence of a field pulse. The obtained DW velocities and Walker breakdown fields are found to follow an opposite trend than that of the in-plane anisotropy ferromagnets. We were also able to observe the so-called creep motion in the low-field motion regime.
