Defects-aggregated cell boundaries induced domain wall curvature change in Fe-rich Sm–Co–Fe–Cu–Zr permanent magnets.
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| Title: | Defects-aggregated cell boundaries induced domain wall curvature change in Fe-rich Sm–Co–Fe–Cu–Zr permanent magnets. |
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| Authors: | Jia, Wentao1 (AUTHOR), Zhou, Xianglong1 (AUTHOR), Xiao, Andong1 (AUTHOR), Song, Xin1 (AUTHOR), Yuan, Tao1,2 (AUTHOR), Ma, Tianyu1 (AUTHOR) matianyu@xjtu.edu.cn |
| Source: | Journal of Materials Science. Sep2020, Vol. 55 Issue 27, p13258-13269. 12p. 8 Diagrams, 1 Graph. |
| Subjects: | Permanent magnets, Domain walls (String models), Domain walls (Ferromagnetism), Magnetic domain walls, Crystal grain boundaries, Pyramidal neurons, Geographic boundaries |
| Abstract: | Raising Fe content has been found to deteriorate the coercivity of the cellular nanostructured Sm–Co–Fe–Cu–Zr 2:17-type permanent magnets because the insufficient 1:5H precipitates cannot occupy all the pyramidal cell boundaries. However, how the defects-aggregated cell boundaries free of 1:5H phase influence the pinning mechanism of magnetic domain walls as well as coercivity remains unknown. Through combined Lorentz and high-resolution transmission electron microscopy investigations, here we found that the magnetic domain walls of a cellular nanostructured Sm25Co44.9Fe21.5Cu5.6Zr3.0 (wt.%) magnet move from the 1:5H cell boundaries towards cell interiors, repulsed by the surrounding defects-aggregated pyramidal cell boundaries. Further investigations revealed that raising the aging temperature can effectively reduce the density of defects-aggregated cell boundaries and enhance effectively the coercivity Hcj from 5.64 to 9.24 kOe for the Fe-rich Sm25Co42.9Fe23.5Cu5.6Zr3.0 (wt.%) magnet. The comparative results suggest that the 1:5H-phase-associated attractive domain wall-pinning is more favorable for achieving large coercivity than the defects-associated repulsive domain wall-pinning. These findings add important insights into the domain wall-pinning mechanism in Sm–Co–Fe–Cu–Zr permanent magnets, which may help to achieve better magnetic performance in the Fe-rich magnets. Most magnetic domain walls (e.g., dashed blue box in (a) stay at the 1:5H pyramidal cell boundaries (b), some (e.g., dashed red box in a) move towards the cell interiors repulsed by the defects-aggregated cell boundaries (DACBs) (c). [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Raising Fe content has been found to deteriorate the coercivity of the cellular nanostructured Sm–Co–Fe–Cu–Zr 2:17-type permanent magnets because the insufficient 1:5H precipitates cannot occupy all the pyramidal cell boundaries. However, how the defects-aggregated cell boundaries free of 1:5H phase influence the pinning mechanism of magnetic domain walls as well as coercivity remains unknown. Through combined Lorentz and high-resolution transmission electron microscopy investigations, here we found that the magnetic domain walls of a cellular nanostructured Sm25Co44.9Fe21.5Cu5.6Zr3.0 (wt.%) magnet move from the 1:5H cell boundaries towards cell interiors, repulsed by the surrounding defects-aggregated pyramidal cell boundaries. Further investigations revealed that raising the aging temperature can effectively reduce the density of defects-aggregated cell boundaries and enhance effectively the coercivity Hcj from 5.64 to 9.24 kOe for the Fe-rich Sm25Co42.9Fe23.5Cu5.6Zr3.0 (wt.%) magnet. The comparative results suggest that the 1:5H-phase-associated attractive domain wall-pinning is more favorable for achieving large coercivity than the defects-associated repulsive domain wall-pinning. These findings add important insights into the domain wall-pinning mechanism in Sm–Co–Fe–Cu–Zr permanent magnets, which may help to achieve better magnetic performance in the Fe-rich magnets. Most magnetic domain walls (e.g., dashed blue box in (a) stay at the 1:5H pyramidal cell boundaries (b), some (e.g., dashed red box in a) move towards the cell interiors repulsed by the defects-aggregated cell boundaries (DACBs) (c). [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00222461 |
| DOI: | 10.1007/s10853-020-04889-9 |
