Halil Ibrahim Sözen, Tilmann Hickel and Jörg Neugebauer win Best Paper Award
Dr. Halil Ibrahim Sözen, Dr. Tilmann Hickel and Prof. Jörg Neugebauer from the department Computational Materials Design at the MPIE, won a Best Paper Award for their article titled “Impact of magnetism on the phase stability of rare-earth based hard magnetic materials”. It was published in a special issue of the CALPHAD Journal on the occasion of Prof. Gerhard Inden’s 80th anniversary and was now selected by the CALPHAD Advisory and Editorial Board members for the best manuscript published in this journal in the year 2020. The prize is endowed with 1000 US-Dollars.
The awarded paper discusses the thermodynamic stability of hard magnetic materials and particularly focuses on changes in free energies and lattice vibrations caused by magnetism. It compares the performance of a magnetic model suggested by Gerhard Inden in 1976 and meanwhile established in the community. To this end, Monte Carlo simulations for modern hard magnetic materials systems such as Ce-Fe-Ti and Nd-Fe-B have been performed. Despite the empirical nature of the Inden model, the paper reports its accurate description of magnetic entropy, which also contributes to faithful predictions for the critical temperature of the considered magnetic alloys. The MPIE team was able to demonstrate how to improve the model by taking the reduction of magnetic moments at finite temperatures into account.