title: Novel Nd(2)Fe(14)B nanoflakes and nanoparticles for the development of high energy nanocomposite magnets.
abstract: 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 Nd(2)Fe(14)B flakes with a thickness below 100 nm and an aspect ratio as high as 10(2)-10(3) 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.
authors.affiliation: Department of Physics and Astronomy, University of Delaware, Newark, DE, USA. nakdogan@udel.edu
authors.forename: Nilay G
authors.initials: NG
authors.lastname: Akdogan
authors.forename: George C
authors.initials: GC
authors.lastname: Hadjipanayis
authors.forename: David J
authors.initials: DJ
authors.lastname: Sellmyer