| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Stability Investigation of Colloidal FePt Nanoparticle Systems by Spectrophotometer Analysis |
| M. Farahmandjou1, S. A. Sebt1, S. S. Parhizgar1, P. Aberomand1, M. Akhavan2 |
| 1Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran2Magnet Research Laboratories (MRL), Department of Physics, Sharif University of Technology, Tehran, Iran |
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| Cite this article: |
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M. Farahmandjou, S. A. Sebt, S. S. Parhizgar et al 2009 Chin. Phys. Lett. 26 027501 |
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Abstract FePt magnetic nanoparticle systems are an excellent candidate for ultrahigh-density magnetic recording. Monodisperse FePt nanoparticles are synthesized by superhydride reduction of FeCl2・4H2O and Pt(acac)2 at 263°C under N2 atmosphere. Transmission electron microscopy (TEM) images show monosize FePt nanoparticles with diameter of 4nm and a standard deviation of about 10%. The average distance between monodispesre particles is nearly 3nm, and oleic acid and oleylamine surround the nanoparticles as surfactants. Stability investigation of nanoparticle colloidal solution is done via spectrophotometery analysis. The results for FePt nanoparticles dispersed in hexane indicate that adding surfactants with concentration of 3×10-3 part by volume for centrifugation stage increases the stability of FePt nanoparticles solution with concentration of 16mg/mL, about 67%.
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| Keywords:
75.50.Tt
75.75.+a
75.50.Ss
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Received: 03 September 2008
Published: 20 January 2009
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