Abstract
Assemblies of monodisperse FePt nanoparticles (NPs) are promising candidates for next generation data storage media with recording densities beyond 1 Tbit.inch due to their high uniaxial magnetocrystalline anisotropy, which can reach 107 J.m-3 along the [001] direction of the face-centered tetragonal (fct) L10 ordered phase.2 Triggered by the seminal work of Sun and coworkers [1] the chemical synthesis of FePt NPs has been extensively studied for the last few years. As-synthesized NPs exhibit a chemically disordered fcc structure. Therefore a post-synthetic treatment of the NPs, such as thermal annealing, is necessary to transform the fcc structure into the ordered fct structure which exhibits the magnetic anitotropy. This phase transition is only possible for close to equimolar stoichiometry (Fe50Pt50) NPs. In this work we present results of in situ annealing of two populations of NPs. The NPs are chemically synthesised, more details can be found in [2].
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References
Sun, S; Murray, C. B.; Weller, D.; Folks, L.; Moser, A. Science. 2000, 287, 1989–1992
V. Monnier, M. Delalande P. Bayle-Guillemaud, Y Samson and P. Reiss, Small (to be published 2008)
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Bayle-Guillemaud, P., Delalande, M., Monnier, V., Samson, Y., Reiss, P. (2008). In situ L10 ordering of FePt nanoparticles. In: Richter, S., Schwedt, A. (eds) EMC 2008 14th European Microscopy Congress 1–5 September 2008, Aachen, Germany. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85226-1_95
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DOI: https://doi.org/10.1007/978-3-540-85226-1_95
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-85225-4
Online ISBN: 978-3-540-85226-1
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