12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone
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Reversible Semiconductor – Metal Transition study in nano-FePt system

Presented by Mr. Steven NKOSI on 13 Jul 2011 from 14:15 to 14:30
Type: Oral Presentation
Session: CMPMS1
Track: Track A - Condensed Matter Physics and Material Science


<p>Highly crystalline nano-spherical Fe-Pt systems were produced by 248 nm laser irradiation of liquid precursor at different laser fluence ranging from 100 – 375 mJ/cm2. The influence of laser intensity on the particle size, iron composition and vibrational properties was systematically investigated. The study reveals that the larger particles have higher iron content. The prepared precursor solution through Fe (III) acetyacetonate and Pt (II) acetyacetonate underwent a deep photolysis to polycrystalline of nano Fe-Pt alloys. Fe (II) and Pt (I) acetyacetone decompose into Fe0 and Pt0 nanoparticles (NPs). The material is shown to contain only iron and platinum by EDS. We have observed hysteretic loop in structural phase transition of Fe60Pt40 NPs. The material shows high resistance (~2,700 Ohms) at lower temperatures and low resistance (~2,200 Ohms) at higher temperatures. Pan theory was used to exemplify the phase transition.

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Room: Parthenon

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