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자료유형
학술저널
저자정보
저널정보
한국자기학회 Journal of Magnetics Journal of Magnetics Vol.3 No.4
발행연도
1998.12
수록면
99 - 104 (6page)

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The Sm₂Fe_(17)Nx materials were prepared by the combination consisting of the HDDR (hydrogenation, disproportionation, desorption, and recombination) process and nitrogenation or by the conventional way consisting of nitrogenation only, and the magnetic and thermomagnetic properties of the materials were investigated. The magnetic characterisation of the prepared Sm₂Fe_(17)Nx materials was performed using a VSM. Thermal stability of the materials was evaluated using a DTA under Ar gas atmosphere. The thermomagnetic characteristics of the materials were examined using a Sucksmith-type balance. The previously HDDR-treated Sm₂Fe_(17) parent alloy was found to be nitrogenated more easily compared to the ordinary Sm₂Fe_(17) alloy. The Sm₂Fe_(17)Nx material produced by the combination method showed a high coercivity (12.9 kOe) even in the state of coarse particle size (around 60 ㎛). It was also revealed that the Sm₂Fe_(17)Nx material produced by the combination has higher thermal stability with respect to the material produced by the conventional way. The Sm₂Fe_(17)Nx material produced by the combination showed an unusual TMA tracing featured with a low and constant magnetisation at lower temperature range and a peak just before the Curie temperature. This thermomagnetic characteristic was interpreted in terms of the competition between two counteracting effects; the decrease in magnetisation due to the thermal agitation at an elevated temperature and the increase in magnetisation resulting from the rotation of magnetisation of the fine grains comparable to a critical single domain size due to the decreased magnetocrystalline anisotropy at an elevated temperature.

목차

Abstract

1. Introduction

2. Experimentals

3. Results and Discussion

4. Conclusions

Acknowledgement

References

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