Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics
(2021) In npj Quantum Materials 6(1).- Abstract
Cerium-based intermetallics are currently attracting much interest as a possible alternative to existing high-performance magnets containing scarce heavy rare-earth elements. However, the intrinsic magnetic properties of Ce in these systems are poorly understood due to the difficulty of a quantitative description of the Kondo effect, a many-body phenomenon where conduction electrons screen out the Ce-4f moment. Here, we show that the Ce-4f shell in Ce–Fe intermetallics is partially Kondo screened. The Kondo scale is dramatically enhanced by nitrogen interstitials suppressing the Ce-4f contribution to the magnetic anisotropy, in striking contrast to the effect of nitrogenation in isostructural intermetallics containing other rare-earth... (More)
Cerium-based intermetallics are currently attracting much interest as a possible alternative to existing high-performance magnets containing scarce heavy rare-earth elements. However, the intrinsic magnetic properties of Ce in these systems are poorly understood due to the difficulty of a quantitative description of the Kondo effect, a many-body phenomenon where conduction electrons screen out the Ce-4f moment. Here, we show that the Ce-4f shell in Ce–Fe intermetallics is partially Kondo screened. The Kondo scale is dramatically enhanced by nitrogen interstitials suppressing the Ce-4f contribution to the magnetic anisotropy, in striking contrast to the effect of nitrogenation in isostructural intermetallics containing other rare-earth elements. We determine the full temperature dependence of the Ce-4f single-ion anisotropy and show that even unscreened Ce-4f moments contribute little to the room-temperature intrinsic magnetic hardness. Our study thus establishes fundamental constraints on the potential of cerium-based permanent magnet intermetallics.
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- author
- Galler, Anna ; Ener, Semih ; Maccari, Fernando ; Dirba, Imants ; Skokov, Konstantin P. ; Gutfleisch, Oliver ; Biermann, Silke LU and Pourovskii, Leonid V.
- organization
- publishing date
- 2021
- type
- Contribution to journal
- publication status
- published
- subject
- in
- npj Quantum Materials
- volume
- 6
- issue
- 1
- article number
- 2
- publisher
- Nature Publishing Group
- external identifiers
-
- scopus:85098781523
- ISSN
- 2397-4648
- DOI
- 10.1038/s41535-020-00301-6
- language
- English
- LU publication?
- yes
- id
- 48913c4f-6e9a-48a2-a68b-9c4e05cee3d8
- date added to LUP
- 2021-01-12 12:45:03
- date last changed
- 2022-04-26 23:24:26
@article{48913c4f-6e9a-48a2-a68b-9c4e05cee3d8,
abstract = {{<p>Cerium-based intermetallics are currently attracting much interest as a possible alternative to existing high-performance magnets containing scarce heavy rare-earth elements. However, the intrinsic magnetic properties of Ce in these systems are poorly understood due to the difficulty of a quantitative description of the Kondo effect, a many-body phenomenon where conduction electrons screen out the Ce-4f moment. Here, we show that the Ce-4f shell in Ce–Fe intermetallics is partially Kondo screened. The Kondo scale is dramatically enhanced by nitrogen interstitials suppressing the Ce-4f contribution to the magnetic anisotropy, in striking contrast to the effect of nitrogenation in isostructural intermetallics containing other rare-earth elements. We determine the full temperature dependence of the Ce-4f single-ion anisotropy and show that even unscreened Ce-4f moments contribute little to the room-temperature intrinsic magnetic hardness. Our study thus establishes fundamental constraints on the potential of cerium-based permanent magnet intermetallics.</p>}},
author = {{Galler, Anna and Ener, Semih and Maccari, Fernando and Dirba, Imants and Skokov, Konstantin P. and Gutfleisch, Oliver and Biermann, Silke and Pourovskii, Leonid V.}},
issn = {{2397-4648}},
language = {{eng}},
number = {{1}},
publisher = {{Nature Publishing Group}},
series = {{npj Quantum Materials}},
title = {{Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics}},
url = {{http://dx.doi.org/10.1038/s41535-020-00301-6}},
doi = {{10.1038/s41535-020-00301-6}},
volume = {{6}},
year = {{2021}},
}