Skip to main content Accessibility help
×
Home

Observations of Magnetic Domain Structure Change in Nd2Fe14B Magnets at Elevated Temperature with External Magnetic Field by Lorentz Microscopy

  • Toshimasa Suzuki (a1), Koichi Kawahara (a1), Haruka Tanaka (a1) and Kimihiro Ozaki (a2)

Abstract

In this study, we conducted the in-situ observations of the magnetic domain structure change in Nd2Fe14B magnets at elevated temperature by transmission electron microscopy (TEM) / Lorentz microscopy. The in-situ observations in Nd2Fe14B magnets revealed that the magnetization reversal easily occurred at the elevated temperature. At more than 180°C, the magnetic domain wall motion could be observed by applying the magnetic field of less than 20 mT. The motion of the magnetic domain wall was discontinuous and the domain wall jumped to one grain boundary to the neighboring grain boundary at 180°C. On the other hand, the continuous domain wall motion within grain interior as well as discontinuous domain wall motion was observed at 225°C, and some grain boundaries showed still strong pinning effect even at 225°C. The temperature dependence of the pinning effect of grain boundaries would not uniform.

Copyright

References

Hide All
1. Ramesh, R., Thomas, G., and Ma, B. M., J. Appl. Phys. 64, 6417 (1988).
2. Sepehri-Amin, H., Ohkubo, T., Nishiuchi, T., Hirosawa, S., and Hono, K., Scr.Mater. 63, 1124 (2010).
3. Akiya, T., Liu, J., Sepehri-Amin, H., Ohkubo, T., Hioki, K., Hattori, A., Hono, K., J. Appl. Phys. 115, 17A766 (2014).
4. Hono, K., Sepehri-Amin, H., Scr.Mater. 67, 530 (2012) Takagi, K., Ishii, M., Soda, R., Ozaki, K., in The 23rd International Workshop on Rare Earth and Future Permanent Magnets and Their Applications (REPM 2014) Processing , edited by Hadjipanayis, G. C. pp. 148.

Keywords

Related content

Powered by UNSILO

Observations of Magnetic Domain Structure Change in Nd2Fe14B Magnets at Elevated Temperature with External Magnetic Field by Lorentz Microscopy

  • Toshimasa Suzuki (a1), Koichi Kawahara (a1), Haruka Tanaka (a1) and Kimihiro Ozaki (a2)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.