Prospect for HRE-free high coercivity Nd-Fe-B permanent magnets

K. Hono; H. Sepehri-Amin

doi:10.1016/j.scriptamat.2018.03.012

Prospect for HRE-free high coercivity Nd-Fe-B permanent magnets

K. Hono, H. Sepehri-Amin

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

Recent state-of-the-art microstructure investigations on Nd-Fe-B sintered magnets have revealed that the Nd₂Fe₁₄B grains in conventional sintered magnets are exchange-coupled through ferromagnetic grain boundary phase and the coercivity is governed by domain wall pinning, while exchange-decoupled sintered magnets can be processed by tuning the chemical composition to a slightly Nd-rich and B-lean one with Ga-doping. The coercivity of exchange-decoupled magnets is governed by the nucleation mechanism, giving rise to higher coercivity. Based on recent studies on microstructure-coercivity relationships of various Nd-Fe-B magnets, prospect of HRE-free high coercivity and high remanence magnets is discussed.

Original language	English
Pages (from-to)	6-13
Number of pages	8
Journal	Scripta Materialia
Volume	151
DOIs	https://doi.org/10.1016/j.scriptamat.2018.03.012
Publication status	Published - 2018 Jul 1
Externally published	Yes

Keywords

Coercivity
Heavy rare earth
Nd-Fe-B
Permanent magnet
Rare earth permanent magnet

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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title = "Prospect for HRE-free high coercivity Nd-Fe-B permanent magnets",

abstract = "Recent state-of-the-art microstructure investigations on Nd-Fe-B sintered magnets have revealed that the Nd2Fe14B grains in conventional sintered magnets are exchange-coupled through ferromagnetic grain boundary phase and the coercivity is governed by domain wall pinning, while exchange-decoupled sintered magnets can be processed by tuning the chemical composition to a slightly Nd-rich and B-lean one with Ga-doping. The coercivity of exchange-decoupled magnets is governed by the nucleation mechanism, giving rise to higher coercivity. Based on recent studies on microstructure-coercivity relationships of various Nd-Fe-B magnets, prospect of HRE-free high coercivity and high remanence magnets is discussed.",

keywords = "Coercivity, Heavy rare earth, Nd-Fe-B, Permanent magnet, Rare earth permanent magnet",

author = "K. Hono and H. Sepehri-Amin",

note = "Funding Information: This work was supported by JST , Collaborative Research Based on Industrial Demand . Publisher Copyright: {\textcopyright} 2018 Acta Materialia Inc.",

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AU - Sepehri-Amin, H.

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N2 - Recent state-of-the-art microstructure investigations on Nd-Fe-B sintered magnets have revealed that the Nd2Fe14B grains in conventional sintered magnets are exchange-coupled through ferromagnetic grain boundary phase and the coercivity is governed by domain wall pinning, while exchange-decoupled sintered magnets can be processed by tuning the chemical composition to a slightly Nd-rich and B-lean one with Ga-doping. The coercivity of exchange-decoupled magnets is governed by the nucleation mechanism, giving rise to higher coercivity. Based on recent studies on microstructure-coercivity relationships of various Nd-Fe-B magnets, prospect of HRE-free high coercivity and high remanence magnets is discussed.

AB - Recent state-of-the-art microstructure investigations on Nd-Fe-B sintered magnets have revealed that the Nd2Fe14B grains in conventional sintered magnets are exchange-coupled through ferromagnetic grain boundary phase and the coercivity is governed by domain wall pinning, while exchange-decoupled sintered magnets can be processed by tuning the chemical composition to a slightly Nd-rich and B-lean one with Ga-doping. The coercivity of exchange-decoupled magnets is governed by the nucleation mechanism, giving rise to higher coercivity. Based on recent studies on microstructure-coercivity relationships of various Nd-Fe-B magnets, prospect of HRE-free high coercivity and high remanence magnets is discussed.

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Prospect for HRE-free high coercivity Nd-Fe-B permanent magnets

Abstract

Keywords

ASJC Scopus subject areas

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