Title :
Effects of Buffer Layer on Structure and Ferromagnetism of Co-Doped SnO
Films
Author :
Liu, Xufeng ; Yu, R.H. ; Jiang, Hongbo ; yang, Bo ; He, Benteng
Author_Institution :
Sch. of Mater. Sci. & Eng., Beihang Univ., Beijing, China
Abstract :
The thickness of SnO2 buffer layers has been found to considerably affect the structure and magnetic properties of Sn1-xCoxO2 films. As the buffer-layer thickness increases, the lattice constant a and Co-O bond length of the Sn1-xCoxO2 films contract, which suggest the gradual relaxation of the accumulated tensile strain. Simultaneously, the amount of structural defects in Sn1-xCoxO2 films decreases significantly and the grain size increases with increasing buffer-layer thickness. All the Sn1-xCoxO2 films exhibit intrinsic ferromagnetism at room temperature and the saturated magnetic moment varies with the buffer-layer thickness. The dependence of ferromagnetism on the buffer-layer thickness can be explained on the basis of the variations in the density of structural defects and Co-O bond length in Sn1-xCoxO2 films.
Keywords :
bond lengths; buffer layers; cobalt; density; ferromagnetic materials; grain size; lattice constants; magnetic moments; magnetic thin films; tin compounds; Sn1-xCoxO2; bond length; buffer layers; density; grain size; intrinsic ferromagnetism; lattice constant; magnetic moment; magnetic properties; structural defects; structural properties; temperature 293 K to 298 K; tensile strain; Buffer layers; Lattices; Magnetic properties; Strain; Tin; Zinc oxide; Diluted magnetic oxide; buffer layer; lattice strain; structural defects;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2011.2158078