Relevance of $4f$-$3d$ exchange to finite-temperature magnetism of rare-earth permanent magnets: an ab-initio-based spin model approach for NdFe$_{12}$N

Munehisa Matsumoto; Hisazumi Akai; Yosuke Harashima; Shotaro Doi; Takashi Miyake

doi:10.1063/1.4952989

paper

Relevance of $4 f$ - $3 d$ exchange to finite-temperature magnetism of rare-earth permanent magnets: an ab-initio-based spin model approach for NdFe $_{12}$ N

arXiv:1504.06697 · doi:10.1063/1.4952989

Abstract

A classical spin model derived ab initio for rare-earth-based permanent magnet compounds is presented. Our target compound, NdFe $_{12}$ N, is a material that goes beyond today's champion magnet compound Nd $_{2}$ Fe $_{14}$ B in its intrinsic magnetic properties with a simpler crystal structure. Calculated temperature dependence of the magnetization and the anisotropy field agree with the latest experimental results in the leading order. Having put the realistic observables under our numerical control, we propose that engineering $5 d$ -electron-mediated indirect exchange coupling between $4 f$ -electrons in Nd and $3 d$ -electrons from Fe would most critically help to enhance the material's utility over the operation-temperature range.

7 pages, 7 figures, ab initio parameters re-defined sustaining the same conclusion, accepted for publication on J. Appl. Phys

References in corpus (1)

Theoretical evaluation on the temperature dependence of magnetic anisotropy constants of Nd2Fe14B - Effects of exchange field and crystal field strength -

Relevance of 4f-3d exchange to finite-temperature magnetism of rare-earth permanent magnets: an ab-initio-based spin model approach for NdFe12​N

Abstract

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Relevance of $4 f$ - $3 d$ exchange to finite-temperature magnetism of rare-earth permanent magnets: an ab-initio-based spin model approach for NdFe $_{12}$ N