New publication in Permanent Magnets

Large single-crystal spheres of SmCo5 have been utilized as model objects for both theoretical and practical studies of the coercivity mechanism in permanent magnets (PM). These samples exhibit coercivity values exceeding 1 T, achieved through the enhancement of surface smoothness.

Our research shows that surface defects play a key role in the reversal mechanism and nucleation process. By utilizing different magnetization protocols, the reversal mechanism and coercivity were studied, shedding light on the influence of two types of nucleus of reversal magnetic domains.

Furthermore, the examination of samples with differing surface states revealed that enhanced surface smoothness corresponds to behaviour closer to the coherent rotation model. This study underscores the significant influence of surface defects on magnetization reversal.

More generally, the study introduces a methodology for examining the magnetization reversal of permanent magnets using simple model objects. This research is not only significant in the field of hard magnetism but also holds promise for potential advancements in various technological applications.

The findings have been published in Journal of Alloys and Compounds, contributing to a better understanding of the coercivity mechanism in permanent magnets and offering a potential pathway for future innovations in this field.

For further information and to read the full article, please visit https://doi.org/10.1016/j.jallcom.2024.174570

H. Zhang, A. Aubert, F. Maccari, C. Dietz, M. Yue, O. Gutfleisch, K. Skokov
Journal of Alloys and Compounds 174570 (2024).