|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials Science for High-Performance Permanent Magnets
||Imaging the Changes in Magnetic Domain Structure in Nd-Fe-B Sintered Magnets throughout the Demagnetisation Process by Soft X-ray Magnetic Circular Dichroism Microscopy
||David Billington, Kentaro Toyoki, Yoshinori Kotani, Hiroyuki Okazaki, Akira Yasui, Wakana Ueno, Satoshi Hirosawa, Tetsuya Nakamura
|On-Site Speaker (Planned)
For permanent magnetic materials, one of the most desirable properties is a large coercivity, a property that is directly related to the nucleation of reversed magnetic domains and pinning of domain walls in the bulk of the magnet. In order to understand how the coercivity depends upon the generation and evolution of reversed magnetic domains, magnetic domain observations throughout the demagnetisation process are essential. Therefore, we have developed a scanning soft x-ray magnetic circular dichroism (XMCD) microscope equipped with a superconducting magnet allowing magnetic domains observations in fractured surfaces under applied magnetic fields. In this talk, I will briefly describe our soft XMCD microscope, and demonstrate its effectiveness by showing some recent results from a commercial Nd-Fe-B sintered magnet. The authors thank T. Nishiuchi and T. Fukagawa from Hitachi Metals, Ltd. for supplying the sample. Part of this work is supported by ESICMM under the outsourcing project of MEXT.