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Magnetic properties of iron and iron platinum alloys synthesized via microemulsion techniques

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5 Author(s)
Carpenter, E.E. ; Advanced Materials Research Institute, University of New Orleans, New Orleans, Louisianna 70148 ; Sims, J.A. ; Wienmann, J.A. ; Zhou, W.L.
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In this article, metallic iron, and iron/platinum alloys nanoparticles have been synthesized via chemical assembly and magnetically characterized. Fabrication of iron and iron/platinum particles was achieved by reducing 0.1 M aqueous metal salts confined in the polar portions of inverse micelles of cetyltrimethylammonium bromide with borohydride. The dc susceptibility of a sample of 8 nm iron nanoparticles exhibits a blocking temperature of 54 K and coercivity of 200 G at 10 K. The presence of the gold coatings prevented oxidation and allowed the samples to be manipulated without additional precautions to prevent oxidation. Two iron/platinum alloys have been synthesized and verified by x-ray powder diffraction and transmission electron microscopy. Magnetic characterization is performed using superconducting quantum interference device magnetometry. © 2000 American Institute of Physics.

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Journal of Applied Physics  (Volume:87 ,  Issue: 9 )