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 0018-9464Full text available as:
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.
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|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|