Ferromagnetic Multipods Fabricated by Solution Phase Synthesis and Hydrogen Reduction

Authors

Y. C. Sui, University of Nebraska - Lincoln
Y. Zhao, University of Nebraska - Lincoln
Sitaram S. Jaswal, University of Nebraska-LincolnFollow
Xingzhong Li, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Date of this Version

6-2007

Comments

Published in IEEE TRANSACTIONS ON MAGNETICS, VOL. 43, NO. 6, JUNE 2007. Copyright © 2007 IEEE. Used by permission.

Abstract

A simple approach combining pyrolysis and hydrogen reduction is formulated for making ferromagnetic-branched nanostructures called Co multipods. The CoO multipods (branched nanostructures) were produced through the pyrolysis of cobalt-oleate in octadecane at 280 °C with the presence of oleic acid under the protection of pure nitrogen. The angles between the nearest arms are 90°. After the reduction of the branched CoO nanostructures in flowing hydrogen gas in a tubular oven at 290°C, the CoO is reduced to pure cobalt with hexagonal crystal structure and the branched shapes are retained. Anisotropic magnetic properties were found for cobalt multipods on silicon substrates.