Inelastic neutron scattering investigation of the crystal field excitations of NdCo\(_5\)

We present an inelastic neutron scattering study of the crystal electric field levels in the intermetallic ferrimagnets RECo\(_{5}\) (RE = Nd and Y). In NdCo\(_{5}\), measurements at \(5~\)K reveal two levels at approximately 28.9 and 52.9 meV. Crystal field calculations including the exchange field...

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Bibliographic Details
Published in:arXiv.org 2023-06
Main Authors: de Almeida Passos, F, Nilsen, G J, Patrick, C E, Le, M D, Balakrishnan, G, Kumar, Santosh, Thamizhavel, A, Cornejo, D R, J Larrea Jiménez
Format: Article
Language:English
Subjects:
Crystals
Electric fields
Ferrimagnets
Inelastic scattering
Neutron scattering
Permanent magnets
Rare earth elements
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Summary:We present an inelastic neutron scattering study of the crystal electric field levels in the intermetallic ferrimagnets RECo\(_{5}\) (RE = Nd and Y). In NdCo\(_{5}\), measurements at \(5~\)K reveal two levels at approximately 28.9 and 52.9 meV. Crystal field calculations including the exchange field \(B_{\textrm{exc}}\) from the Co sites account for both of these, as well as the spectrum at temperatures above the spin-reorientation transition at \(\sim 280\)~K. In particular, it is found that both a large hexagonal crystal field parameter \(A_{6}^6\langle r^6 \rangle\) and \(B_{\textrm{exc}}\) are required to reproduce the data, with the latter having a much larger value than that deduced from previous computational and experimental studies. Our study sheds light on the delicate interplay of terms in the rare-earth Hamiltonian of RECo\(_5\) systems, and is therefore expected to stimulate further experimental and computational work on the broader family of rare-earth permanent magnets.
ISSN:2331-8422