Simultaneous tuning of the magnetic anisotropy and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase Fe $$_{16}$$ 16 N $$_{2}$$ 2

Simultaneous tuning of the magnetic anisotropy and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase Fe $$_{16}$$ 16 N $$_{2}$$ 2

Abstract Simultaneously enhancing the uniaxial magnetic anisotropy ( $$K_u$$ K u ) and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase Fe $$_{16}$$ 16 N $$_{2}$$ 2 without inclusion of heavy-metal or rare-earth (RE) elements has been a challenge over the years. Herein, through first-pri...

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Main Authors: D. Odkhuu, S. C. Hong
Format: article
Language:EN
Published: Nature Portfolio 2021
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Science
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Online Access:https://doaj.org/article/a988d09896294f6b8ee011f1dc0c1a04
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spelling oai:doaj.org-article:a988d09896294f6b8ee011f1dc0c1a042021-12-02T14:26:07ZSimultaneous tuning of the magnetic anisotropy and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase Fe $$_{16}$$ 16 N $$_{2}$$ 210.1038/s41598-021-87077-22045-2322https://doaj.org/article/a988d09896294f6b8ee011f1dc0c1a042021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-87077-2https://doaj.org/toc/2045-2322Abstract Simultaneously enhancing the uniaxial magnetic anisotropy ( $$K_u$$ K u ) and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase Fe $$_{16}$$ 16 N $$_{2}$$ 2 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 $$K_u$$ K u is proposed to be achievable through excess valence electrons in the Fe $$_{16}$$ 16 N $$_{2}$$ 2 unit cell. We demonstrate a persistent increase in $$K_u$$ K u up to 1.8 MJ m $$^{\text {-}3}$$ - 3 , a value three times that of 0.6 MJ m $$^{\text {-}3}$$ - 3 in $$\alpha ^{''}$$ α ′ ′ -Fe $$_{16}$$ 16 N $$_{2}$$ 2 , 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 $$K_u$$ K u up to 2.4 MJ m $$^{\text {-}3}$$ - 3 in (Fe $$_{0.5}$$ 0.5 Co $$_{0.5}$$ 0.5 ) $$_{16}$$ 16 N $$_{2}$$ 2 obtained by replacing Co with Ni to Ga. Such a strong $$K_u$$ K u 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 $$K_u$$ K u and the thermal stability in 3d-only metals for RE-free permanent magnet applications.D. OdkhuuS. C. HongNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
D. Odkhuu
S. C. Hong
Simultaneous tuning of the magnetic anisotropy and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase Fe $$_{16}$$ 16 N $$_{2}$$ 2
description Abstract Simultaneously enhancing the uniaxial magnetic anisotropy ( $$K_u$$ K u ) and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase Fe $$_{16}$$ 16 N $$_{2}$$ 2 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 $$K_u$$ K u is proposed to be achievable through excess valence electrons in the Fe $$_{16}$$ 16 N $$_{2}$$ 2 unit cell. We demonstrate a persistent increase in $$K_u$$ K u up to 1.8 MJ m $$^{\text {-}3}$$ - 3 , a value three times that of 0.6 MJ m $$^{\text {-}3}$$ - 3 in $$\alpha ^{''}$$ α ′ ′ -Fe $$_{16}$$ 16 N $$_{2}$$ 2 , 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 $$K_u$$ K u up to 2.4 MJ m $$^{\text {-}3}$$ - 3 in (Fe $$_{0.5}$$ 0.5 Co $$_{0.5}$$ 0.5 ) $$_{16}$$ 16 N $$_{2}$$ 2 obtained by replacing Co with Ni to Ga. Such a strong $$K_u$$ K u 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 $$K_u$$ K u and the thermal stability in 3d-only metals for RE-free permanent magnet applications.
format article
author D. Odkhuu
S. C. Hong
author_facet D. Odkhuu
S. C. Hong
author_sort D. Odkhuu
title Simultaneous tuning of the magnetic anisotropy and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase Fe $$_{16}$$ 16 N $$_{2}$$ 2
title_short Simultaneous tuning of the magnetic anisotropy and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase Fe $$_{16}$$ 16 N $$_{2}$$ 2
title_full Simultaneous tuning of the magnetic anisotropy and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase Fe $$_{16}$$ 16 N $$_{2}$$ 2
title_fullStr Simultaneous tuning of the magnetic anisotropy and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase Fe $$_{16}$$ 16 N $$_{2}$$ 2
title_full_unstemmed Simultaneous tuning of the magnetic anisotropy and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase Fe $$_{16}$$ 16 N $$_{2}$$ 2
title_sort simultaneous tuning of the magnetic anisotropy and thermal stability of $$\alpha ^{''}$$ α ′ ′ -phase fe $$_{16}$$ 16 n $$_{2}$$ 2
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/a988d09896294f6b8ee011f1dc0c1a04
work_keys_str_mv AT dodkhuu simultaneoustuningofthemagneticanisotropyandthermalstabilityofalphaaphasefe1616n22
AT schong simultaneoustuningofthemagneticanisotropyandthermalstabilityofalphaaphasefe1616n22
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