|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials Science for High-Performance Permanent Magnets
||Analyses on Magnetization Reversal Process of Nd-Fe-B Hot-deformed Magnets
||Satoshi Okamoto, Takahiro Yomogita, Luran Zhang, Nobuaki Kikuchi, Osamu Kitakami, Hossein Sepehri-Amin, Tadakatsu Ohkubo, Kazuhiro Hono, Takahiro Akiya, Keiko Hioki, Atsushi Hattori
|On-Site Speaker (Planned)
We have explored the magnetization reversal process of Nd-Fe-B hot-deformed magnets with and without eutectic alloy grain boundary diffusion processes through FORC diagram measurement and energy barrier analysis based on magnetic viscosity measurement. Although the values of coercivity for the magnets with and without the grain boundary diffusion processes are quite different, it is surprising that there are very little differences on the FORC diagrams and energy barrier analysis among these magnets. The FORC diagram measurement reveals very narrow switching field distribution and very small effect of the local demagnetization field in the magnets. The energy barrier analysis indicates that nucleation of reversed domains takes place at the beginning of the magnetization reversal and then domain wall propagation becomes the dominant magnetization reversal process for the most part of the demagnetization process. The barrier heights and the intrinsic reversal fields for the nucleation and the wall pinning are quantitatively discussed.