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Metal–oxide films with magnetically-modulated nanoporous architectures

Published online by Cambridge University Press:  31 January 2011

Craig A. Grimes ,
R. Suresh Singh ,
Elizabeth C. Dickey  and
Oomman K. Varghese
Craig A. Grimes*
Affiliation:
Department of Electrical Engineering & Materials Research Institute, 204 Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
R. Suresh Singh
Affiliation:
Department of Electrical Engineering & Materials Research Institute, 204 Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Elizabeth C. Dickey
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
Oomman K. Varghese
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802
*
a)e-mial: cgrimes@engr.psu.edu
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Abstract

A magnetically-driven method for controlling nanodimensional porosity in sol-gel-derived metal–oxide films, including TiO2, Al2O3, and SnO2, coated onto ferromagnetic amorphous substrates, such as the magnetically-soft Metglas1 alloys, is described. On the basis of the porous structures observed dependence on external magnetic field, a model is suggested to explain the phenomena. Under well-defined conditions it appears that the sol particles coming out of solution, and undergoing Brownian motion, follow the magnetic field lines oriented perpendicularly to the substrate surface associated with the magnetic domain walls of the substrate; hence the porosity developed during solvent evaporation correlates with the magnetic domain size.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 6 , June 2001 , pp. 1686 - 1693
Copyright
Copyright © Materials Research Society 2001

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