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Formation of 2-D and 3-D Arrays of Colloidal Co Magnetic Nanoparticles

Published online by Cambridge University Press:  01 February 2011

Y. Chushkin ,
L. Chitu ,
S. Luby ,
E. Majkova ,
A. Satka ,
V. Holy ,
J. Ivan ,
M. Giersig ,
M. Hilgendorff  and
T. H. Metzger
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Y. Chushkin
Affiliation:
Institute of Physics SAS, 845 11 Bratislava, Slovakia
L. Chitu
Affiliation:
Institute of Physics SAS, 845 11 Bratislava, Slovakia
S. Luby
Affiliation:
Institute of Physics SAS, 845 11 Bratislava, Slovakia
E. Majkova
Affiliation:
Institute of Physics SAS, 845 11 Bratislava, Slovakia
A. Satka
Affiliation:
International Laser Center and Faculty of Electrical Engineering and Informatics SUT, 812 19 Bratislava, Slovakia
V. Holy
Affiliation:
Institute of Condensed Matter Physics, Masaryk University, 611 37 Brno, Czech Republic
J. Ivan
Affiliation:
Institute of Materials and Machine Mechanics SAS, 83102 Bratislava, Slovakia
M. Giersig
Affiliation:
Caesar research center, Ludwig-Erhard-Allee 2, 53175 Bonn, Germany
M. Hilgendorff
Affiliation:
Caesar research center, Ludwig-Erhard-Allee 2, 53175 Bonn, Germany
T. H. Metzger
Affiliation:
European Synchrotron Radiation Facility, 38043 Grenoble Cedex, France
O. Konovalov
Affiliation:
European Synchrotron Radiation Facility, 38043 Grenoble Cedex, France
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Abstract

Ordering of Co nanoparticles (∼11 nm in diameter) into 2-D and 3-D arrays on Si/Si3N4 substrates in external magnetic field and without field is reported. Arrays of particles were studied by TEM, SEM and GISAXS. The GISAXS measurements were performed at the wavelengths 0.155 nm and 0.336 nm and the spectra were simulated using distorted wave Born approximation approach. From results it follows that 2-D ordered monolayers of particles are composed of hexagonal close-packed mosaic blocks. 3-D arrays – rods are formed along magnetic field direction, being parallel or perpendicular to the substrate surface, when the colloid was more concentrated. Distribution of particles in rods was analyzed only by GISAXS and it was described by close packing of hard spheres. Their effective diameter was 14.7 nm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 877: Symposium S – Magnetic Nanoparticles and Nanowires , 2005 , S6.18
Copyright
Copyright © Materials Research Society 2005

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