Novel Nd2Fe14B nanoflakes and nanoparticles for the development of high energy nanocomposite magnets

High energy ball milling has been shown to be a promising method for large-scale fabrication of rare earth--transition metal nanoparticles. In this work, magnetically hard Nd--Fe--B nanopowders with a coercivity in the range of 1.2--4 kOe have been produced by surfactant-assisted ball milling of nan...

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Bibliographic Details
Published in:Nanotechnology 2010-07, Vol.21 (29), p.295705-295705
Main Authors: Akdogan, Nilay G, Hadjipanayis, George C, Sellmyer, David J
Format: Article
Language:English
Subjects:
Anisotropy
Ball milling
Flakes
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
Neodymium
Texture
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Summary:High energy ball milling has been shown to be a promising method for large-scale fabrication of rare earth--transition metal nanoparticles. In this work, magnetically hard Nd--Fe--B nanopowders with a coercivity in the range of 1.2--4 kOe have been produced by surfactant-assisted ball milling of nanocrystalline precursor alloys. The nanopowders consisted of Nd2Fe14B flakes with a thickness below 100 nm and an aspect ratio as high as 102--103 and anisotropic square nanoparticles with a size of 11 nm. Both the nanoparticles and nanoflakes showed a strong [001] out-of-plane texture. The nanoparticles showed a spin reorientation temperature which is lower (117 K) than the bulk value (135 K). The successful fabrication of Nd--Fe--B nano-thin flakes and anisotropic nanoparticles provides hope for the development of nanocomposite permanent magnets with an enhanced energy product.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/21/29/295705