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Ion Implantation Synthesis and Characterization of Cobalt Nanodots

Published online by Cambridge University Press:  15 February 2011

L.G. Jacobsohn ,
M.E. Hawley ,
R.M. Dickerson ,
D.W. Cooke  and
M. Nastasi
L.G. Jacobsohn
Affiliation:
Materials Science & Technology Division, Los Alamos National Laboratory MST-8 G755, P.O. Box 1663, Los Alamos, NM 87545, USA
M.E. Hawley
Affiliation:
Materials Science & Technology Division, Los Alamos National Laboratory MST-8 G755, P.O. Box 1663, Los Alamos, NM 87545, USA
R.M. Dickerson
Affiliation:
Materials Science & Technology Division, Los Alamos National Laboratory MST-8 G755, P.O. Box 1663, Los Alamos, NM 87545, USA
D.W. Cooke
Affiliation:
Materials Science & Technology Division, Los Alamos National Laboratory MST-8 G755, P.O. Box 1663, Los Alamos, NM 87545, USA
M. Nastasi
Affiliation:
Materials Science & Technology Division, Los Alamos National Laboratory MST-8 G755, P.O. Box 1663, Los Alamos, NM 87545, USA
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Abstract

A study of the synthesis of Co nanodots by ion implantation was carried out. Silica was implanted with 35 keV Co+ ion beams with doses of 8×1015, 3×1016 and 1×1017 at/cm2 and transmission electron microscopy revealed the presence of spherical nanodots in these samples. Annealing in vacuum at 900 oC was used to change the size distribution of the nanodots. The annealed samples presented an absorption band related to the plasmon collective excitation of the metallic nanodots that redshifted for higher Co contents. The magnetic character of the samples was revealed by magnetic force microscopy measurements that showed the presence of randomly distributed structures with defined magnetization in the case of annealed samples. This work shows the feasibility of synthesizing Co nanodots with controlled size distribution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 777: Symposium A – Nanostructuring Materials with Energetic Beams , 2003 , T6.7
Copyright
Copyright © Materials Research Society 2003

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