About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Magnetic Materials for Energy and Power Conversion Applications
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Presentation Title |
Magnetic Domain Observation by Soft X-ray Magnetic Circular Dichroism Microscopy of Nd-Fe-B-Ga Sintered Magnets Under High Magnetic Field and High Temperature |
Author(s) |
Andres Martin Cid, Shintaro Kobayashi, David Billington, Kentaro Toyoki, Yoshinori Kotani, Yukio Takada, Takashi Sato, Yuji Kaneko, Akira Kato, Taisuke Sasaki, Tadakatsu Ohkubo, Kazuhiro Hono, Satoshi Hirosawa, Motohiro Suzuki, Tetsuya Nakamura |
On-Site Speaker (Planned) |
Andres Martin Cid |
Abstract Scope |
The addition of Ga to Nd-Fe-B sintered magnets has been reported to induce much larger coercivity enhancements than standard Nd-Fe-B sintered magnets after a post-sintered annealing process. This enhancement is connected to an improved grain boundary with a reduced amount of Fe and the presence of the antiferromagnetic Nd6(Fe,Ga)14 phase, although the role of this phase has not been yet clarified. In this work, we show the observation by soft X-ray magnetic circular dichroism microscopy of the magnetic domain reversal process of a Nd-Fe-B-Ga sintered magnet at several temperatures below and above the Néel temperature (TN) of the Nd6(Fe,Ga)14 phase (~130 °C) up to 200 °C. We found that some grains exhibit a change from single-domain to multi-domain reversal when increasing the temperature above the TN. This experimental result is possibly the beginning to clarify the relationship between the coercivity and the magnetism of the Nd6(Fe,Ga)14 phase. |
Proceedings Inclusion? |
Planned: |