Ferromagnetic Multipods Fabricated by Solution Phase Synthesis and Hydrogen Reduction

Author

Sui, Y.C. ; Zhao, Y. ; Zhang, J. ; Jaswal, S. ; Li, X.Z. ; Sellmyer, D.J.

Author_Institution

Dept. of Phys. & Astron., Nebraska Univ., Lincoln, NE

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

3115

Lastpage

3117

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 280degC with the presence of oleic acid under the protection of pure nitrogen. The angles between the nearest arms are 90deg. After the reduction of the branched CoO nanostructures in flowing hydrogen gas in a tubular oven at 290degC, 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

Keywords

cobalt; coercive force; crystal structure; ferromagnetic materials; magnetic anisotropy; magnetic hysteresis; magnetic structure; materials preparation; nanostructured materials; nanotechnology; pyrolysis; remanence; 280 degC; 290 degC; 90 degC; Co; Si; anisotropic magnetic properties; branched nanostructures; cobalt; ferromagnetic multipods; hexagonal crystal structure; hydrogen reduction; pyrolysis; solution phase synthesis; Anisotropic magnetoresistance; Arm; Cobalt; Hydrogen; Magnetic properties; Nanostructures; Nitrogen; Ovens; Protection; Shape; Co multipods; chemical synthesis; hydrogen reduction; magnetically anisotropic;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.894204

Filename

4202929