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Effect of Sintered Grain Growth on Chemical Ordering in Binary FePt/Cu Nanoparticle Arrays

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Abstract:

Recent studies have shown a strong correlation between grain growth and chemical ordering in chemically synthesized FePt nanoparticles. In order to study this effect, we have prepared a series of samples in which 3.5 nm FePt nanoparticles are dispersed in a matrix of Cu nanoparticles. The samples were annealed at 600 °C and at 800 °C. Grain size was determined by XRD Scherrer analysis and time-dependent remanent coercivity measurements were made to determine the intrinsic remanent coercivity, Hcr0. For samples annealed at 600 °C, Hcr0 increases strongly with grain size up to ∼5 nm and increases weakly with additional grain growth. By contrast, after annealing at 800 °C, Hcr0 appears nearly independent of grain size. The results suggest that isolated 3.5 nm FePt nanoparticles can be weakly ordered when annealed at 600 °C and sintering is necessary for significant chemical ordering.

Keywords: CHEMICAL ORDERING; FEPT NANOPARTICLES; MAGNETIC ANISOTROPY

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2006.361

Publication date: 2006-07-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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