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Magnetic anisotropy of R2Fe17Nx compounds

X.C. Kou, F.R. de Boer, G. Chouteau

Open publisher page 3 citations

Abstract

A nearly perfect magnetic alignment of R2Fe17Nx powders (<20 μm) with respect to the c axis was obtained by using the sample-rotation magnetic-alignment technique. The magnetization from 4.2 to 300 K was measured on the magnetically aligned samples by means of the sample-extraction method in a static field up to 23 T. The Fe-sublattice anisotropy was determined by analyzing the magnetization curves of R2Fe17Nx with R=Y, Ce, Gd, and Lu. Compared to corresponding R2Fe17 compounds, the Fe-sublattice anisotropy of R2Fe17Nx is substantially lower. For R2Fe17Nx with R=Pr, Nd, Sm, Tb, and Er, the magnetization curves in the [001] direction show no anomaly whereas a first-order magnetization process (FOMP) was detected in corresponding R2Fe17 compounds, suggesting that the FOMP transition in R2Fe17 is suppressed upon nitrogenation.

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What this paper is about

A nearly perfect magnetic alignment of R2Fe17Nx powders (<20 μm) with respect to the c axis was obtained by using the sample-rotation magnetic-alignment technique. The magnetization from 4.2 to 300 K was measured on the magnetically aligned samples by means of the sample-extraction method in a static field up to 23 T. The Fe-sublattice anisotropy was determined by analyzing the magnetization curves of R2Fe17Nx with R=Y, Ce, Gd, and Lu. Compared to corresponding R2Fe17 compounds, the Fe-sublattice anisotropy of R2Fe17Nx is substantially lower. For R2Fe17Nx with R=Pr, Nd, Sm, Tb, and Er, the magnetization curves in the [001] direction show no anomaly whereas a first-order magnetization process (FOMP) was detected in corresponding R2Fe17 compounds, suggesting that the FOMP transition in R2Fe17 is suppressed upon nitrogenation.

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Available abstract

A nearly perfect magnetic alignment of R2Fe17Nx powders (<20 μm) with respect to the c axis was obtained by using the sample-rotation magnetic-alignment technique. The magnetization from 4.2 to 300 K was measured on the magnetically aligned samples by means of the sample-extraction method in a static field up to 23 T. The Fe-sublattice anisotropy was determined by analyzing the magnetization curves of R2Fe17Nx with R=Y, Ce, Gd, and Lu. Compared to corresponding R2Fe17 compounds, the Fe-sublattice anisotropy of R2Fe17Nx is substantially lower. For R2Fe17Nx with R=Pr, Nd, Sm, Tb, and Er, the magnetization curves in the [001] direction show no anomaly whereas a first-order magnetization process (FOMP) was detected in corresponding R2Fe17 compounds, suggesting that the FOMP transition in R2Fe17 is suppressed upon nitrogenation.

Key concepts: Magnetization, Magnetic anisotropy, Anisotropy, Condensed matter physics, Materials science, Remanence, Magnetic field, Nuclear magnetic resonance

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