|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials Science for High-Performance Permanent Magnets
||Large-scale Micromagnetics Simulation for Initial Magnetization Process in Nd-Fe-B Hot-deformed Nanocrystalline Magnet
||Hiroshi Tsukahara, Kaoru Iwano, Chiharu Mitsumata, Tadashi Ishikawa, Kanta Ono
|On-Site Speaker (Planned)
For the development of high-performance permanent magnet, it is indispensable to know the magnetization dynamics. Nd-Fe-B hot-deformed nanocrystalline permanent magnets are promising materials with high coercivity without the use of heavy rare-earth elements. It is known that initial magnetization curve of Nd-Fe-B hot-deformed magnet has two-step structure, but the initial magnetization mechanism is not fully understood yet. We performed large-scale micromagnetics simulation under periodic boundary condition to investigate initial magnetization process of the Nd-Fe-B nanocrystalline permanent magnet. A simulation model contains more than 3,000 grains, and the size of this model is 2048× 2048 × 512 nm <SUP>3</SUP> with 0.3 billion calculation cells. Initial magnetization curve from our simulation clearly shows two-step behavior. In the first step, magnetic domain walls in the multi-domain grains moves and, in the second step, the magnetization of the single domain grains are reversed.