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Title
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Semihard iron-based permanent-magnet materials
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Author
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Abstract
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| Permanent magnets generally require a favorable, but difficult-to-achieve combination of high magnetization, Curie point, and magnetic anisotropy. Thus there have been few, if any, viable permanent magnets developed since the 1982 discovery of Nd2Fe14B [M. Sagawa, S. Fujimura, H. Yamamoto, Y. Matsuura, and S. Hirosawa, J. Appl. Phys. 57, 4094 (1985)]. Here we point out, both by direct first-principles calculations on the iron carbides and silicides Fe5C2, Fe5SiC, and Fe7C3 as well as a discussion of recent experimental findings, that there are numerous rare-earth-free iron-rich potential permanent-magnet materials with sufficient intrinsic magnetic properties to reasonably achieve room-temperature energy products of 20-25 MG Oe. This is substantially better than the performance of the best available rare-earth-free magnets based on ferrite, as well as shape-anisotropy-employing alnico. These magnets could plausibly fill, at low cost, the present performance "gap" [J. M. D. Coey, Scr. Mater. 67, 524 (2012)] between the best rare-earth-free magnets and rare-earth magnets such as Nd2Fe14B and Sm-Co. |
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Language
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English
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Source (journal)
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Physical review applied. - College Park, Md, 2014, currens
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Publication
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College Park, Md
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American Physical Society
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2021
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ISSN
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2331-7019
[Online]
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DOI
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10.1103/PHYSREVAPPLIED.15.024012
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Volume/pages
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15
:2
(2021)
, 10 p.
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Article Reference
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024012
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ISI
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000614707800002
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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