Abstract
High anisotropy, L1{sub 0}, FePt nanoparticle assemblies consisting of 4 nm diameter particles are considered a potential data storage medium beyond 1 Tbit/in{sup 2}. However, annealing at temperatures >500 C is required to form the high anisotropy phase. Recently work on the evolution of FePt nanoparticle assemblies as a function of annealing temperature has shown that for T{sub anneal} > 650 C a substantial drop in magnetization is observed. Here we show that the observed reduction in magnetization is due to silicide formation as a result of a chemical reaction with the native oxide or Si substrate. We also show that the fraction of particles with L1{sub 0} ordering increases as a function of annealing time with full L1{sub 0} ordering established only after annealing at 725 C for 60mins. We note that particle agglomeration also occurs under these conditions.
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