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Controlling the Microstructure and Magnetic Properties of Ferromagnetic Nanocrystals Produced by Ion Implantation

Published online by Cambridge University Press:  15 March 2011

K.S. Beaty ,
A. Meldrum ,
J.P. Franck ,
K. Sorge ,
J. R. Thompson ,
C.W. White ,
R.A. Zuhr ,
L.A. Boatner  and
S. Honda
K.S. Beaty
Affiliation:
The University of Alberta, Edmonton, AB
A. Meldrum
Affiliation:
The University of Alberta, Edmonton, AB
J.P. Franck
Affiliation:
The University of Alberta, Edmonton, AB
K. Sorge
Affiliation:
The University of Tennessee, Knoxville, TN
J. R. Thompson
Affiliation:
The University of Tennessee, Knoxville, TN
C.W. White
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN
R.A. Zuhr
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN
L.A. Boatner
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN
S. Honda
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN
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Abstract

Ion implantation coupled with annealing is a versatile and flexible approach to creating ferromagnetic near-surface nanocomposites that represent a wide range of particle/host combinations. We have used ion implantation and thermal processing to create a layer of Co nanoparticles in a sapphire host that was subsequently irradiated with Xe, Pt, or Pb in order to systematically modify the magnetic properties of the composite. Transmission electron microscopy (reported in an accompanying paper in this volume) was used to carry out a detailed characterization of the microstructure of the resulting near-surface composites whose magnetic properties were determined using SQUID magnetometry or magnetic circular dichroism. These composites exhibit magnetic hysteresis with coercivities ranging from near zero (i.e., superparamagnetism) up to 1.2 kG - depending on the composition and microstructure. We also present the results of preliminary experiments in which we attempt to control the spatial distribution of magnetic elements within ion-implanted ferromagnetic nanocomposites. The results demonstrate methods for tailoring the magnetic properties of nanocomposites produced by ion implantation for specific applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 703: Symposia U/V – Nanophase and Nanocomposite Materials IV , 2001 , V9.4
Copyright
Copyright © Materials Research Society 2002

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References

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