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Magnetic Nanoparticle Arrays with Ultra-Uniform Length Electrodeposited in Highly Ordered Alumina Nanopores(“Alumite”)

Published online by Cambridge University Press:  17 March 2011

Robert M. Metzger ,
Ming Sun ,
Giovanni Zangari  and
Mohammad Shamsuzzoha
Robert M. Metzger
Affiliation:
Center for Materials for Information Technology and Departments of Chemistry and Metallurgical and Materials Engineering, University of Alabama, Tuscaloosa, AL 35487, USA
Ming Sun
Affiliation:
Center for Materials for Information Technology and Departments of Chemistry and Metallurgical and Materials Engineering, University of Alabama, Tuscaloosa, AL 35487, USA
Giovanni Zangari
Affiliation:
Center for Materials for Information Technology and Departments of Chemistry and Metallurgical and Materials Engineering, University of Alabama, Tuscaloosa, AL 35487, USA
Mohammad Shamsuzzoha
Affiliation:
Center for Materials for Information Technology and Departments of Chemistry and Metallurgical and Materials Engineering, University of Alabama, Tuscaloosa, AL 35487, USA
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Abstract

We report nanometer-scale ordered arrays of cylindrical magnetic nanoparticles with low aspect ratio and ultra-high uniformity. Protracted anodization provides hexagonally ordered nanopores in amorphous Al2O3. For instance, pulsed electrochemical deposition grows Co particles of uniform length from the bottoms of these pores: these particles are polycrystalline and randomly oriented. The magnetism of the array is dominated by particle shape and by inter-particle magnetostatic interactions. A very clear transition of the anisotropy from perpendicular to in-plane is observed at a height to radius ratio of about 2. This pulse-reverse electrodeposition shows great promise for a reliable synthesis of uniform nanostructures of many metals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 636: Symposium D – Nonlithographic and Lithographic Methods of Nanofabrication-From Ultralarge Scale , 2000 , D9.33.1
Copyright
Copyright © Materials Research Society 2001

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