Purpose and Objectives of “Project for High Performance Anisotropic Nanocomposite Permanent Magnets with Low Rare-Earth Content”

哲, 広沢; 武司, 西内; 忠勝, 大久保; Li, W. F.; 宝野和博,; 二郎, 山崎; 昌晃, 竹澤; 兼治, 隅山; 佐益, 山室

doi:10.2320/jinstmet.73.135

J. Japan Inst. Metals

2009

DOI: 10.2320/jinstmet.73.135

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Purpose and Objectives of “Project for High Performance Anisotropic Nanocomposite Permanent Magnets with Low Rare-Earth Content”

広沢哲¹,

西内武司²,

大久保忠勝³

et al.

Abstract: Purpose and objectives of``Project for High Performance Anisotropic Nanocomposite Permanent Magnets with Low Rare Earth Content'', a subproject of MEXT's``Element Science and Technology Project'', is briefly discussed and recent findings obtained from multi scale analysis of a hydrogenation disproportionaion desorption recombination (HDDR) processed Nd Fe Co Ga B alloy is presented.

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Cited by 6 publications

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Mechanism of Coercivity Inducement in Nd-Fe-B Magnets Produced by Hydrogenation-Disproportionation-Desorption-Recombination (HDDR) Process

武司¹,

智仁²,

哲³

2012

J. Japan Inst. Metals

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Hydrogenation disproportionation desorption recombination (HDDR) process has been expected to develop high coercivity Nd Fe B magnets without relying on heavy rare earth elements. In this paper, recent studies of magnetization behaviors and microstructural evolution of HDDR processed magnet materials are reviewed and discussed, particularly focusing on the coercivity inducement mechanism in this type of materials and a prospect of achieving high coercivity values in Nd Fe B magnets.

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Mechanism of Coercivity Inducement in Nd-Fe-B Magnets Produced by Hydrogenation-Disproportionation-Desorption-Recombination (HDDR) Process

武司¹,

智仁²,

哲³

2012

J. Japan Inst. Metals

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Magnetic Domain Observation and Magnetization Process Analysis of Nd-Fe-B Sub-Micron Grain Sized Magnet with High-Resolution Kerr Microscope

昌晃¹

2012

J. Japan Inst. Metals

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A Kerr microscope that uses ultraviolet (UV) light for high resolution magnetic domain observation was built, and the domain structure and magnetization process of hydrogenation disproportionation desorption recombination (HDDR) magnets were examined. The UV Kerr microscope can observe nanometer sized domain patterns. The coercivity of the HDDR magnet depends on the area of magnetization reversal during a reversal process. Magnetization reversal in a few grains simultaneously occurs in a low coercivity magnet, because the Nd rich phase along the grain boundaries is absent. On the other hand, magnetization reversal in a grain independently occurs owing to an adequate Nd rich phase along the grain boundaries in a high coercivity magnet. It follows that the high coercivity of an HDDR magnet is due to domain wall pinning at the grain boundaries.

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Current Situation and Perspectives of Anisotropic Nanocomposite Permanent Magnet

Hirosawa

2012

J. Japan Inst. Metals and Materials

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In this review, some of selected theoretical and experimental studies on anisotropic nanocomposite permanent magnets are discussed. In order to achieve a large energy product surpassing those of anisotropic sintered Nd Fe B magnets, magnetic anisotropy of Nd 2 Fe 14 B dose not seem to be sufficiently large whereas strategic consideration of natural resources requires usage of Fe Nd based hard magnetic phases. As a future direction of research, it is proposed that composite magnets may be pursued as a means of reducing rare earth contents in a rare earth magnets, as was successfully achieved in the case of isotropic nanocomposite permanent magnets based on the Nd Fe B system. To realize sizable coercivity in the anisotropic nanocomposite magnets, domain wall movement should be pinned by internal microstructure in the hard magnetic phase, which eventually leads to requirement of intrinsic pinning of very narrow domain walls in the hard magnetic phase with a large anisotropy constant.

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Purpose and Objectives of “Project for High Performance Anisotropic Nanocomposite Permanent Magnets with Low Rare-Earth Content”

Cited by 6 publications

References 4 publications

Mechanism of Coercivity Inducement in Nd-Fe-B Magnets Produced by Hydrogenation-Disproportionation-Desorption-Recombination (HDDR) Process

Mechanism of Coercivity Inducement in Nd-Fe-B Magnets Produced by Hydrogenation-Disproportionation-Desorption-Recombination (HDDR) Process

Magnetic Domain Observation and Magnetization Process Analysis of Nd-Fe-B Sub-Micron Grain Sized Magnet with High-Resolution Kerr Microscope

Current Situation and Perspectives of Anisotropic Nanocomposite Permanent Magnet

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