Abstract
NiAlxFe2−xO4/SiO2 (0≤x≤1.0) nanocomposite films deposited on Si(100) substrates were prepared by a sol–gel spin-coating method. The influences of Al3+ content and annealing temperature on the structural and electromagnetic properties of the nanocomposite films were investigated. The results indicated that NiAlxFe2−xO4 in the nanocomposite films crystallized after annealing at 1073K and above. When the doping content x increased from 0 to 1.0, the lattice constants and the average crystallite sizes of the NiAlxFe2−xO4 nanoparticles decreased. The saturation magnetization and coercivity of the films were inversely proportional to the Al3+ content. The maximum value of saturation magnetization (361.6emu/cm3) and the minimum value of coercivity (18.6kA/m) were obtained for x of 0.2. When the annealing temperature increased from 1073 to 1473K, the lattice constant and the average crystallite size of the NiAl0.2Fe1.8O4 nanoparticles increased from 0.8322 to 0.8349nm and 4 to 28nm, respectively, and the saturation magnetization and coercivity of the films increased from 214.8 to 464.5emu/cm3 and 8.2 to 26.9kA/m, respectively. Moreover, the DC resistivity of the films increased with increasing Al3+ content and annealing temperature.
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