Coercivity enhancement in heavy rare earth-free NdFeB magnets by grain boundary diffusion process

Salazar, D.; Martín-Cid, A.; Madugundo, R.; Barandiaran, J. M.; Hadjipanayis, G. C.

doi:10.1063/1.5043389

Title: Coercivity enhancement in heavy rare earth-free NdFeB magnets by grain boundary diffusion process

Journal Article · Mon Oct 08 00:00:00 EDT 2018 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5043389· OSTI ID:1610141

Salazar, D. ^[1]; Martín-Cid, A. ^[1]; Madugundo, R. ^[1]; Barandiaran, J. M. ^[2]; Hadjipanayis, G. C. ^[3]

BCMaterials, Leioa (Spain). Basque Center for Materials, Applications and Nanostructures
BCMaterials, Leioa (Spain). Basque Center for Materials, Applications and Nanostructures; Univ. of the Basque Country, Donostia (Spain)
Univ. of Delaware, Newark, DE (United States)

Grain boundary diffusion of a Pr₃(Co,Cu) eutectic alloy has been performed for coercivity enhancement on Nd-lean Nd₁₀Fe₈₄B₆ nanocrystalline ribbons. The coercivity increases from 0.5 T to 2.5 T after 6 h of infiltration at 600 °C. High resolution electron microscopy and energy dispersive X-ray spectroscopy show that the excess α-Fe present in the initial samples diminishes during infiltration, giving rise to the formation of a Rare Earth-rich RE-Fe inter-boundary phase and a layer of (Nd,Pr)₂Fe₁₄B close to the surface of the hard magnetic grains. Such a microstructure favours the coercivity by increasing the nucleation field for reversal magnetization and providing magnetically isolated/decoupled hard grains.

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Research Organization:: Univ. of Delaware, Newark, DE (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-90ER45413

OSTI ID:: 1610141

Journal Information:: Applied Physics Letters, Vol. 113, Issue 15; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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Cited By (3)

Effect of grain-boundary diffusion process on the geometry of the grain microstructure of $Nd − Fe − B$ nanocrystalline magnets Titov, Ivan; Barbieri, Massimiliano; Bender, Philipp Physical Review Materials, Vol. 3, Issue 8 https://doi.org/10.1103/physrevmaterials.3.084410	journal	August 2019
Prospect of developing Nd–Fe–B-type magnet with high electrical resistivity Kwon, Hae-Woong; Kang, Min-Seok Rare Metals, Vol. 39, Issue 1 https://doi.org/10.1007/s12598-019-01336-w	journal	December 2019
Clarifying the effects of La and Ce in the grain boundary diffusion sources on sintered NdFeB magnets Zeng, H. X.; Yu, H. Y.; Zhou, Q. Materials Research Express, Vol. 6, Issue 10 https://doi.org/10.1088/2053-1591/ab3756	journal	August 2019

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