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No.1(pp.1-37)

Home > Issues > Volume 4 (1999) > No.1(pp.1-37)

Thermomagnetic Characteristics of the Hard Magnetic Materials with a Fine Microstructure due to a HDDR Process

Journal of Magnetics, Volume 4, Number 1, 31 Mar 1999, Pages 26-32

H.W. Kwon(Pukyong National University), Yoon-B. Kim(Matal Processing Research Centre, Korea Institute of Science and Technology), W. Y. Jeung(Matal Processing Research Centre, Korea Institute of Science and Technology)

Abstract

The HDDR process can be used as an effective means of processing of the coercive Nd-Fe-B-type or the Sm₂Fe₁₇N_x materials. The HDDR (hydrogenation, disproportionation, desorption, recombination) processed materials are feartured with a very fine microstructure. The thermomagnetic characteristics of the Nd-Fe-B-type or the Sm₂Fe₁₇N_x materials with fine microstructure due to the HDDR process were investigated. It has been found that the fine-microstructured hard magnetic materials showed an unusual TMA (Thermomagnetic analysis) tracting featured with a low and constant magnetization at lower temperature range and a peak just below their Curie temperatures when a low external field is applied. This thermomagnetic characteristic was immediate particularly in the TMA with a low applied field. This thermomagnetic characteristic was interpreted in terms of the competition between two counteracting effects; the decrease in magnetication due to the thermal agitation at an elevated temperature and the increase in magnetization resulting from the rotation of magnetization of the fine grains comparable to a critical single domain size due to the decreased magnetocrystalline anisotropy at an elevated temperature.

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