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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.
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]
Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Defects-aggregated cell boundaries induced domain wall curvature change in Fe-rich Sm–Co–Fe–Cu–Zr permanent magnets.
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  Data: <searchLink fieldCode="AR" term="%22Jia%2C+Wentao%22">Jia, Wentao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhou%2C+Xianglong%22">Zhou, Xianglong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xiao%2C+Andong%22">Xiao, Andong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Song%2C+Xin%22">Song, Xin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yuan%2C+Tao%22">Yuan, Tao</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ma%2C+Tianyu%22">Ma, Tianyu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> matianyu@xjtu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%22">Journal of Materials Science</searchLink>. Sep2020, Vol. 55 Issue 27, p13258-13269. 12p. 8 Diagrams, 1 Graph.
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  Data: 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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  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Materials Science is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10853-020-04889-9
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        Text: English
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        PageCount: 12
        StartPage: 13258
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        Type: general
      – SubjectFull: Domain walls (String models)
        Type: general
      – SubjectFull: Domain walls (Ferromagnetism)
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      – SubjectFull: Magnetic domain walls
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      – SubjectFull: Crystal grain boundaries
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      – SubjectFull: Pyramidal neurons
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      – SubjectFull: Geographic boundaries
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      – TitleFull: Defects-aggregated cell boundaries induced domain wall curvature change in Fe-rich Sm–Co–Fe–Cu–Zr permanent magnets.
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              Text: Sep2020
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