Permanent magnets are a key technology for modern society with applications in air conditioning, mobility or power generation. The measured coercive fields in modern permanent magnets reach only a small fraction of the theoretical values. A series of experimental studies have shown that discontinuities and misalignment at the atomic scale significantly affect the macroscopic coercivity. In this project, we develop a quantitative theory of coercivity, taking into account the local atomic structure, the spatial variation of the intrinsic magnetic properties, and the physical microstructure of the magnet. To achieve this goal we bridge the length scale between ab-initio simulations, atomistic spin dynamics and continuum micromagnetic simulations. Atomic defects at interfaces and grain boundaries will be considered already at the smallest possible length scale, the unit cells of the material composition. The developed theory is guided by well described magnetic materials to validate the system throughout the progress of the project.
On 20.5. we were able to inspire young and old at the Long Night of Research 2022. The influence of permanent magnets on electromobility was demonstrated at a hands-on station. Those interested were able to find out how magnets influence the performance of electric motors with simple experiments. With our project we were able to show how important it is to develop permanent magnets without critical rare earths materials.
The first kick-off meeting took place on July 4 in Krems. Participants were Dominik Legut and Sergiu Arapan from TU Ostrava, Czech Republic. And from Krems, Thomas Schrefl, Markus Gusenbauer, Harald Özelt, Alexander Kovacs and Qais Ali were represented. There was also a guest researcher from Ukraine, Dr. Oleksandr Hrushko. Among the topics discussed were the first phase of the project, in which we are focusing on the Fe/Ni material combination and implementing the adaptive grid for the microstructures of the simulations. We also discussed the possibility of linking the characterization of the mechanical properties of magnets to the project. Afterwards, a social evening took place at a local “Heuriger” with a view to the Danube.
On July 13, 2022, we organized a workshop at the Junge Uni on the Krems campus. Children between the ages of 10 and 13 learned about how an electric motor works. They were able to make a small electric motor and experience how the strength of a magnet affects the power of a motor. Thomas Schrefl, Harald Özelt and Markus Gusenbauer were the supervising researchers at the workshop.
Markus Gusenbauer gave a talk at JEMS2022 on July 26, 2022 entitled: "Coercivity analysis of twin boundaries". The talk was virtually shown at the hybrid event in Warsaw, Poland (https://jems2022.pl).
FWF, Projekt: I I 5712-N