Coercivity enhancement of rapidly solidified Nd-Fe-B magnet powders

H. Sepehri-Amin; D. Prabhu; M. Hayashi; T. Ohkubo; K. Hioki; A. Hattori; K. Hono

doi:10.1016/j.scriptamat.2012.10.005

Coercivity enhancement of rapidly solidified Nd-Fe-B magnet powders

H. Sepehri-Amin, D. Prabhu, M. Hayashi, T. Ohkubo, K. Hioki, A. Hattori, K. Hono

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

49 Citations (Scopus)

Abstract

A high coercivity of 2.6 T is achieved in melt-spun Nd-Fe-B isotropic magnet powders by the grain boundary diffusion process using Nd ₈₀Cu₂₀ and Nd₈₂Al₁₈ alloys. δM measurements indicate that Nd₂Fe₁₄B nanocrystals are magnetically decoupled after the diffusion process. Transmission electron microscopy revealed that the exchange decoupling is due to the formation of a thin Nd-rich phase at the grain boundaries. The mechanism of the coercivity enhancement is discussed based on microstructure observations and micromagnetic simulations.

Original language	English
Pages (from-to)	167-170
Number of pages	4
Journal	Scripta Materialia
Volume	68
Issue number	3-4
DOIs	https://doi.org/10.1016/j.scriptamat.2012.10.005
Publication status	Published - 2013 Feb
Externally published	Yes

Keywords

Coercivity
Diffusion process
Exchange coupling
Grain boundary
Nd-Fe-B

ASJC Scopus subject areas

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

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10.1016/j.scriptamat.2012.10.005

Cite this

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title = "Coercivity enhancement of rapidly solidified Nd-Fe-B magnet powders",

abstract = "A high coercivity of 2.6 T is achieved in melt-spun Nd-Fe-B isotropic magnet powders by the grain boundary diffusion process using Nd 80Cu20 and Nd82Al18 alloys. δM measurements indicate that Nd2Fe14B nanocrystals are magnetically decoupled after the diffusion process. Transmission electron microscopy revealed that the exchange decoupling is due to the formation of a thin Nd-rich phase at the grain boundaries. The mechanism of the coercivity enhancement is discussed based on microstructure observations and micromagnetic simulations.",

keywords = "Coercivity, Diffusion process, Exchange coupling, Grain boundary, Nd-Fe-B",

author = "H. Sepehri-Amin and D. Prabhu and M. Hayashi and T. Ohkubo and K. Hioki and A. Hattori and K. Hono",

note = "Funding Information: This work was supported by CREST, Japan Science and Technology Agency (JST), Japan. H.S.-A. acknowledges International Center for Young Scientists (ICYS), NIMS for provision of the ICYS fellowship.",

year = "2013",

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doi = "10.1016/j.scriptamat.2012.10.005",

language = "English",

volume = "68",

pages = "167--170",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier Limited",

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T1 - Coercivity enhancement of rapidly solidified Nd-Fe-B magnet powders

AU - Sepehri-Amin, H.

AU - Prabhu, D.

AU - Hayashi, M.

AU - Ohkubo, T.

AU - Hioki, K.

AU - Hattori, A.

AU - Hono, K.

N1 - Funding Information: This work was supported by CREST, Japan Science and Technology Agency (JST), Japan. H.S.-A. acknowledges International Center for Young Scientists (ICYS), NIMS for provision of the ICYS fellowship.

PY - 2013/2

Y1 - 2013/2

N2 - A high coercivity of 2.6 T is achieved in melt-spun Nd-Fe-B isotropic magnet powders by the grain boundary diffusion process using Nd 80Cu20 and Nd82Al18 alloys. δM measurements indicate that Nd2Fe14B nanocrystals are magnetically decoupled after the diffusion process. Transmission electron microscopy revealed that the exchange decoupling is due to the formation of a thin Nd-rich phase at the grain boundaries. The mechanism of the coercivity enhancement is discussed based on microstructure observations and micromagnetic simulations.

AB - A high coercivity of 2.6 T is achieved in melt-spun Nd-Fe-B isotropic magnet powders by the grain boundary diffusion process using Nd 80Cu20 and Nd82Al18 alloys. δM measurements indicate that Nd2Fe14B nanocrystals are magnetically decoupled after the diffusion process. Transmission electron microscopy revealed that the exchange decoupling is due to the formation of a thin Nd-rich phase at the grain boundaries. The mechanism of the coercivity enhancement is discussed based on microstructure observations and micromagnetic simulations.

KW - Coercivity

KW - Diffusion process

KW - Exchange coupling

KW - Grain boundary

KW - Nd-Fe-B

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DO - 10.1016/j.scriptamat.2012.10.005

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SP - 167

EP - 170

JO - Scripta Materialia

JF - Scripta Materialia

IS - 3-4

ER -

Coercivity enhancement of rapidly solidified Nd-Fe-B magnet powders

Abstract

Keywords

ASJC Scopus subject areas

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