Growth and magnetism of FePt:C composites in nanoscale channels

Authors

Yucheng Sui, University of Nebraska-LincolnFollow
J. Zhou, University of Nebraska - Lincoln
Xingzhong Li, University of Nebraska-LincolnFollow
Ralph Skomski, University of Nebraska-LincolnFollow
David J. Sellmyer, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

6-1-2004

Comments

Published by American Institute of Physics. J. Applied Physics 95, 6741-6743 (2004). ©2004 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

Nanochannels of porous alumina films were used as nanoreactors for the reaction of hydrogen gas with a mixture of Fe nitrate and Pt chloride. This results in the formation of of FePt clusters within the nanochannels. Both the sizes of the clusters and the coercivity the cluster assembly increase with the increase of annealing temperature. In order to reduce excessive agglomeration at high temperature, carbon was introduced by chemical vapor deposition and FePt:C composites in nanoscale channels were created. When FePt clusters were synthesized with carbon and heat treated at high temperatures, cluster sizes were much smaller than those without carbon, suggesting that the introduced carbon serves effectively to block the agglomeration of clusters. The coercivity of the FePt:C composite containing the smaller clusters is as high as 29.0 kOe.