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Magnetic properties of NdFe11Ti and YFe11Ti, from experiment and theory
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DOI：10.1016/j.actamat.2022.118473.png)
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Abstract
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NdFe11Ti and YFe11Ti serve as prototypes for rare-earth (RE) lean or REfree magnets with the ThMn12-type structure. Although NdFe11Ti has been studied for a long time the origin of its complex magnetism at low temperature is so far not well-understood. We present a comprehensive theoretical and experimental study of the magnetic properties of NdFe11Ti and RE-free YFe11Ti to elucidate the influence of the 4f electrons. The partially localized 4 f electrons of Nd are the driving force behind the complex behavior of the magnetocrystalline anisotropy which changes from cone to uniaxial above 170 dK. The spontaneous magnetization and the five leading anisotropy constants were determined from high-quality single crystal samples over a wide temperature range using field dependencies of magnetization measured along the principle crystallographic directions. The experimental data are compared with density functional theory combined with a Hartree-Fock correction (+U) and an approximate dynamical mean-field theory. (c) 2022 The Author(s). Published by Elsevier Ltd on behalf of Acta Materialia Inc.
Keywords:
Permanent magnets
Rare-earths
Anisotropy
Magnetism
DFT
DMFT
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