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- Title
Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics.
- Authors
Galler, Anna; Ener, Semih; Maccari, Fernando; Dirba, Imants; Skokov, Konstantin P.; Gutfleisch, Oliver; Biermann, Silke; Pourovskii, Leonid V.
- 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.
- Subjects
MAGNETIC anisotropy; INTERMETALLIC compounds; CERIUM compounds; MAGNETIC properties; RARE earth metals; KONDO effect
- Publication
NPJ Quantum Materials, 2021, Vol 6, Issue 1, p1
- ISSN
2397-4648
- Publication type
Article
- DOI
10.1038/s41535-020-00301-6