KLI

Simultaneous tuning of the magnetic anisotropy and thermal stability of a′′-phase Fe16N2

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Abstract
Simultaneously enhancing the uniaxial magnetic anisotropy (Ku) and thermal stability of a"-phase Fe16N2 without inclusion of heavy-metal or rare-earth (RE) elements has been a challenge over the years. Herein, through first-principles calculations and rigid-band analysis, significant enhancement of Ku is proposed to be achievable through excess valence electrons in the Fe16N2 unit cell. We demonstrate a
persistent increase in Ku up to 1.8 MJ m -3 , a value three times that of 0.6 MJ m -3 in a"-Fe16N2 , by simply replacing Fe with metal elements with more valence electrons (Co to Ga in the periodic table). A similar rigid-band argument is further adopted to reveal an extremely large Ku up to 2.4 MJ m -3 in (Fe0.5Co0.5)16N2 obtained by replacing Co with Ni to Ga. Such a strong Ku can also be achieved with the replacement by Al, which is isoelectronic to Ga, with simultaneous improvement of the phase stability. These results provide an instructive guideline for simultaneous manipulation of Ku and the thermal stability in 3d-only metals for RE-free permanent magnet applications.
Author(s)
Dorj Odkhuu홍순철
Issued Date
2021
Type
Article
Keyword
Permanent magnetFe16N2Rare-earth freeMagnetic AnisotropyFirst-principles Calculation
DOI
10.1038/s41598-021-87077-2
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9504
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_proquest_journals_2510491930&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Simultaneous%20tuning%20of%20the%20magnetic%20anisotropy%20and%20thermal%20stability%20of%20a%E2%80%B2%E2%80%B2-phase%20Fe16N2&offset=0&pcAvailability=true
Publisher
SCIENTIFIC REPORTS
Location
독일
Language
영어
ISSN
2045-2322
Citation Volume
11
Citation Number
1
Citation Start Page
7823
Citation End Page
7823
Appears in Collections:
Natural Science > Physics
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