Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5492217 | Physica B: Condensed Matter | 2016 | 14 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
D. Vokoun, M. SvatuÅ¡ka, J. OlejnÃÄek, M. Kohout, J. Drahokoupil, M. RameÅ¡, J. Vejpravová, A. MantlÃková, L. Fekete, J. KopeÄek, L. KlimÅ¡a, O. Heczko,