Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics

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 q...

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Auteurs principaux:	Anna Galler, Semih Ener, Fernando Maccari, Imants Dirba, Konstantin P. Skokov, Oliver Gutfleisch, Silke Biermann, Leonid V. Pourovskii
Format:	article
Langue:	EN
Publié:	Nature Portfolio 2021
Sujets:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Accès en ligne:	https://doaj.org/article/46b5255889cd499da05044f96270329c
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spelling	oai:doaj.org-article:46b5255889cd499da05044f96270329c2021-12-02T13:35:39ZIntrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics10.1038/s41535-020-00301-62397-4648https://doaj.org/article/46b5255889cd499da05044f96270329c2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41535-020-00301-6https://doaj.org/toc/2397-4648Abstract 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.Anna GallerSemih EnerFernando MaccariImants DirbaKonstantin P. SkokovOliver GutfleischSilke BiermannLeonid V. PourovskiiNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Anna Galler Semih Ener Fernando Maccari Imants Dirba Konstantin P. Skokov Oliver Gutfleisch Silke Biermann Leonid V. Pourovskii Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics
description	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 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.
format	article
author	Anna Galler Semih Ener Fernando Maccari Imants Dirba Konstantin P. Skokov Oliver Gutfleisch Silke Biermann Leonid V. Pourovskii
author_facet	Anna Galler Semih Ener Fernando Maccari Imants Dirba Konstantin P. Skokov Oliver Gutfleisch Silke Biermann Leonid V. Pourovskii
author_sort	Anna Galler
title	Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics
title_short	Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics
title_full	Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics
title_fullStr	Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics
title_full_unstemmed	Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics
title_sort	intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/46b5255889cd499da05044f96270329c
work_keys_str_mv	AT annagaller intrinsicallyweakmagneticanisotropyofceriuminpotentialhardmagneticintermetallics AT semihener intrinsicallyweakmagneticanisotropyofceriuminpotentialhardmagneticintermetallics AT fernandomaccari intrinsicallyweakmagneticanisotropyofceriuminpotentialhardmagneticintermetallics AT imantsdirba intrinsicallyweakmagneticanisotropyofceriuminpotentialhardmagneticintermetallics AT konstantinpskokov intrinsicallyweakmagneticanisotropyofceriuminpotentialhardmagneticintermetallics AT olivergutfleisch intrinsicallyweakmagneticanisotropyofceriuminpotentialhardmagneticintermetallics AT silkebiermann intrinsicallyweakmagneticanisotropyofceriuminpotentialhardmagneticintermetallics AT leonidvpourovskii intrinsicallyweakmagneticanisotropyofceriuminpotentialhardmagneticintermetallics
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Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics

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