Structure and magnetic properties of Co-W clusters produced by inert gas condensation

Authors

Farhad Reza Golkar-Fard, University of Nebraska-LincolnFollow
Matthew J. Kramer, Ames Laboratory, USDOEFollow
Y. Zhang, Ames Laboratory
R. W. McCallum, Ames Laboratory
Ralph Skomski, University of Nebraska-LincolnFollow
David J. Sellmyer, NCMNFollow
Jeffrey E. Shield, University of Nebraska-LincolnFollow

Date of this Version

2012

Citation

JOURNAL OF APPLIED PHYSICS 111, 07B524 (2012). doi:10.1063/1.3676425

Comments

Copyright © 2012 American Institute of Physics. Used by Permission.

Abstract

In this article, inert-gas condensation was used to synthesize Co-W clusters. The formation, structure, and magnetic properties of the clusters were investigated. Sub-10-nm clusters were obtained, and the structures and average sizes were strongly dependent on sputtering power. At low sputtering powers, the clusters were predominantly amorphous, while, at high sputtering power, the clusters were crystalline. X ray diffraction and transmission electron microscopy revealed clusters with hcp structure at high sputtering power. The magnetic properties were dependent on the sputtering power and temperature, with the highest coercivity of 810 Oe at 10 K for high sputtering power.