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Summary: Manipulating the Magnetic Structure of Co Core/CoO Shell Nanoparticles:
Implications for Controlling the Exchange Bias
S. E. Inderhees,1
J. A. Borchers,2
K. S. Green,1
M. S. Kim,1,3
K. Sun,1
G. L. Strycker,1
and M. C. Aronson1,3
1
University of Michigan, Ann Arbor, Michigan 48109-1120, USA
2
National Institute for Standards and Technology, Gaithersburg Maryland 20899-8562, USA
3
Brookhaven National Laboratory, Upton New York 11973, USA
(Received 26 May 2008; published 9 September 2008)
We present an experimental study of the effects of oxidation on the magnetic and crystal structures of
exchange biased -Co=CoO core-shell nanoparticles. Transmission electron microscopy measurements
reveal that oxidation creates a Co-CoO interface which is highly directional and epitaxial in quality.
Neutron diffraction measurements find that below a NeŽel temperature TN of $235 K the magnetization of
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