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Magnetic properties of FePt nanoparticles annealed with NaCl

Jones, B.A., O'Grady, K., Hickey, B.J., Li, D., Poudyal, N., Liu, J.P. and Dutson, J.D. (2006) Magnetic properties of FePt nanoparticles annealed with NaCl. IEEE TRANSACTIONS ON MAGNETICS. pp. 3066-3068. ISSN 0018-9464

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Abstract

FePt nanoparticles have the potential to extend the data density of magnetic recording beyond 1 Tbit/in(2). The phase transformation from low anisotropy, face-centered cubic to face-centered tetragonal with high anisotropy is essential and complex. The samples measured in this paper were annealed in a mixture with fine ground (< 20 mu m) NaCl. The switching field distributions and activation volumes of two different sizes of particles are presented, 4 and 15 nm. The samples exhibit complex structural behaviour, demonstrating how difficult it is to obtain uniform nanoparticles. We find that the 4-nm particles reverse coherently whereas the 15 nm do not due to inhomogeneous crystallinity.

Item Type: Article
Copyright, Publisher and Additional Information: © 2006 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: FePt nanoparticle, L1(o) phase, phase transformation, RECORDING MEDIA, COERCIVITY
Academic Units: The University of York > Physics (York)
Depositing User: Repository Officer
Date Deposited: 15 Dec 2006
Last Modified: 17 Oct 2013 14:18
Published Version: http://dx.doi.org/10.1109/TMAG.2006.880153
Status: Published
Refereed: Yes
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/1825

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