Karl Franzens University Graz | Graz University of Technology | |
New hard magnetic materials and applications: A micromagnetic study The search for new candidates of suitable magnetic materials, structures and their expected behaviour as the reduction or the replacement for rare earth elements in permanent magnets is of great economical and scientific interest. On the basis of density functional theory calculations and numerical finite element micromagnetics we have analysed the limits of crystal anisotropy and shape anisotropy on the optimization of magnetization reversal processes in order to improve the coercive field of advanced hard magnetic materials, such as rare earth (RE) intermetallic compounds RECo5 and RE2Fe14B. Numerical finite element micromagnetic simulations based on the Landau-Lifshitz-Gilbert equation for magnetization reversal have been carried out in order to study the influence of the microstructure on the hysteresis properties. The results of the micromagnetic simulations are compared with high resolution and nanoanalytical TEM investigations of various Nd-Fe-B sintered magnets with different RE content and coercive field, respectively. |