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Controlled Assembly of Monodisperse ε-Cobalt-Based Nanocrystals

Published online by Cambridge University Press:  21 February 2011

S. Sun,
C. B. Murray and
H. Doyle
S. Sun
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, NY 10598, ssun@us.ibm.com
C. B. Murray
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, NY 10598
H. Doyle
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, NY 10598
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Abstract

General synthetic routes to monodisperse c-cobalt (β-Mn type phase) nanocrystals (ε-Co) and controlled assembly of these nanocrystals are presented in this paper. The ε-Co particles are obtained by superhydride reduction of cobalt chloride (anhydrous or hexahydrate) in a high temperature solution phase (200°C) in the presence of a combination of long chain diol, oleic acid and trialkylphosphine. Monodisperse nanocrystals are isolated by size selective precipitation. As synthesized cobalt particles are each a single crystal with a complex cubic structure related to the beta phase of elemental manganese (β-Mn). Self-assembly of these uniform cobalt particles on solid substrates is induced by evaporation of the carrier solvent producing 2-D and 3-D magnetic superlattices. Annealing of assembled ε-Co nanocrystal arrays converts them to the hcp cobalt crystal arrays. The inter-particle distance can be adjusted by selected thermal treatments or by chemical ligand exchange. This control over particle dimensions, crystallinity and assembly offers a model system for the study of ultra-high density recording media.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 577: Symposium H – Advanced Hard and Soft Magnetic Materials , 1999, 385
Copyright
Copyright © Materials Research Society 1999

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