NDLI: Enhancing Coercivity of Sintered Nd-Fe–B Magnets by Nanoparticle Addition

Content Provider	IEEE Xplore Digital Library
Author	Nguyen Huy Dan PhamThi Thanh Nguyen Hai Yen Luu Tien Hung
Copyright Year	1965
Abstract	In this paper, we investigated the influence of addition of Dy₄₀Nd₄₀Al₃₀ nanoparticles on the structure and magnetic properties of sintered Nd-Fe-B magnets. The nanoparticles with a size smaller than 50 nm were prepared using high-energy ball milling method and then mixed with micrometer Nd₂Fe₁₄B powder before magnetic anisotropic pressing, vacuum sintering, and annealing. The structure of the magnets was thoroughly analyzed using X-ray diffraction and electron microscopy techniques. The magnetic properties of the magnets were investigated on a pulsed field magnetometer. The atoms of Dy were detected mainly at the grain boundaries and partly in the near-boundary area of the grains. On adding 2% of the nanoparticles, the coercivity of the magnets is enhanced by quite a large amount, from 12 kOe for the unadded magnets to 21 kOe for the added ones. The large increase of the coercivity is probably due to the diffusion of Dy to the Nd₂Fe₁₄B grains to form (Nd,Dy)₂Fe₁₄B phases with high magnetocrystalline anisotropy. The nanoparticles might make Dy distribute more homogeneously and diffuse to the Nd₂Fe₁₄B grains more efficiently.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	4
Page Count	4
File Size	830102
File Format	PDF
ISSN	00189464
Volume Number	50
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Perpendicular magnetic anisotropy Magnetic resonance imaging Magnetic hysteresis Coercive force Magnetometers Heat treatment sintered Nd-Fe¿B magnet Anisotropic magnet hard magnetic material high coercivity nanoparticles
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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