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Magnetic properties of FePt nanoparticles annealed with NaCl

By B.A. Jones, K. O'Grady, B.J. Hickey, D. Li, N. Poudyal, J.P. Liu and J.D. Dutson

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

Year: 2006
DOI identifier: 10.1109/TMAG.2006.880153
OAI identifier: oai:eprints.whiterose.ac.uk:1825

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