Ni–TiO^sub 2^ nanocomposite films and their magnetic properties

We have demonstrated a method for preparing nickel nanoparticles in TiO2 matrix films, 500-900 nm thick, using magnetron sputtering followed by a heat treatment at temperatures 723-773 K for 1 h in various gas atmospheres. The X-ray diffraction indicated that the size of Ni crystallites was 4-6 nm d...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2016-12, Vol.503, p.44
Main Authors: Vokoun, D, Svatuška, M, Olejnícek, J, Kohout, M, Drahokoupil, J, Rameš, M, Vejpravová, J, Mantlíková, A, Fekete, L, Kopecek, J, Klimša, L, Heczko, O
Format: Article
Language:English
Subjects:
Anisotropy
Antiferromagnetism
Clustering
Crystallites
Heat treating
Heat treatment
Magnetic anisotropy
Magnetic fields
Magnetic moments
Magnetic properties
Magnetron sputtering
Nanocomposites
Nanoparticles
Nickel
Thick films
Titanium oxides
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Summary:We have demonstrated a method for preparing nickel nanoparticles in TiO2 matrix films, 500-900 nm thick, using magnetron sputtering followed by a heat treatment at temperatures 723-773 K for 1 h in various gas atmospheres. The X-ray diffraction indicated that the size of Ni crystallites was 4-6 nm depending on the heat treatment conditions. Magnetic force and scanning electron microscopy studies show clustering the nanoparticles to size of order hundreds of nm arranged in a shape of nanopillars separated by TiO2. The above mentioned clustering results in a magnetic anisotropy as indicated from the loops of the magnetic moment - magnetic field curves in the perpendicular and parallel directions. Some of the prepared nanocomposite samples exhibit different magnetic behavior within the perpendicular and parallel directions for |µ0H|>0.6 T, presumably due to the presence of antiferromagnetic oxides.
ISSN:0921-4526
1873-2135