Bibliographic Details
| Title: |
New structural features and pinning-evolved coercivity mechanism: A potential route for developing high coercivities in anisotropic Sm-Fe-N material |
| Authors: |
Liming Ye, Fengqing Wang, Yang Liu, Haoran Zhou, Lei Liu, Yong Ding, Yingli Sun, Aru Yan |
| Source: |
Journal of Materials Research and Technology, Vol 30, Iss , Pp 451-460 (2024) |
| Publisher Information: |
Elsevier, 2024. |
| Publication Year: |
2024 |
| Collection: |
LCC:Mining engineering. Metallurgy |
| Subject Terms: |
Coercivity, Sm-Fe-N material, Anisotropy, Coercivity mechanism, Pinning, Mining engineering. Metallurgy, TN1-997 |
| More Details: |
Sm-Fe-N material holds immense promise as new material for developing next generation permanent magnets. However, the achievement of high coercivity in this material remains a big challenge, and moreover new coercivity theories beyond the commonly considered nucleation-type mechanism needs exploration. This study describes both the yielding of anisotropic Sm-Fe-N powders with high coercivities and the discovery of new coercivity mechanism by a systematic study using a designed milling preparation method. As a result, a random-direction cleavage behavior with unexpected XRD peak shifts and formation of new micron-sized flower-like particles were found in the yielded Sm-Fe-N powders. The grain sizes of the powders are of nanoscale dimension and they refine gradually as the milling time increases. The measured coercivity is up to 15.0 kOe, which is a substantial increase of approximately 36.4% compared to the original commercial powders and among the highest reported values via the milling preparation method (commonly below 13 kOe). The yielded powders also demonstrate a new dual-type coercivity mechanism (combing both nucleation-type and pinning-type control effect), and the improved pining effect contributes to the high coercivities. This study opens the door of utilizing pinning effect for achieving high coercivities in anisotropic Sm-Fe-N material. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2238-7854 |
| Relation: |
http://www.sciencedirect.com/science/article/pii/S2238785424005684; https://doaj.org/toc/2238-7854 |
| DOI: |
10.1016/j.jmrt.2024.03.040 |
| Access URL: |
https://doaj.org/article/b2141b47cb4d456fabac6ab7dbda577d |
| Accession Number: |
edsdoj.b2141b47cb4d456fabac6ab7dbda577d |
| Database: |
Directory of Open Access Journals |
