|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials Science for High-Performance Permanent Magnets
||Temperature Dependence of Threshold of Magnetic Fields for Nucleation and Domain Wall Propagation
||Seiji Miyashita, Masamichi Nishino
|On-Site Speaker (Planned)
In order to study coercive mechanism of permanent magnets at finite temperatures, we studied temperature dependence of threshold of magnetic fields for nucleation and domain wall propagation in a sandwich structure of hard-soft-hard magnet. We found general features of the reduction of the threshold with the temperature. In particular, we found novel dependences due to the narrow domain wall effect due to the reduction of the exchange energy. We also studied the nucleation and domain wall propagation in a realistic modeling of Nd-Fe-B magnets by making use of real structure and parameters which are obtained in literatures and also from the first-priciple calculations. There we reproduced experimentally-observed properties, and also we found some microscopic properties related to the magnetization reversal in the material.