Stoichiometric thin films of LiNbO3 have been deposited on (100) silicon by a pulsed excimer laser deposition technique. By studying several cases of depositions in vacuum, oxygen, and argon, as well as oxygen-argon mixture as ambients, it is brought out that the desired stoichiometry in the film can be attained only by having an appropriate oxygen-argon mixture during deposition. The films have been characterized by x-ray diffraction, infrared transmission, and spectroscopic ellipsometry techniques.
Strontium hexaferrite nanoparticles have been successfully prepared from a sintered SrFe12O19 target, using pulsed excimer laser ablation and cold condensation technique. The as-condensed powders do not exhibit the same magnetic properties as the target material. However, annealing at a high temperature of 850 °C for 3 h in air followed by fast cooling yields very high coercivity of 6665 Oe, exhibiting presence of single domain particles. Vibrating sample magnetometry (VSM), scanning electron microscopy (SEM), and x-ray diffraction (XRD) techniques are used to study the magnetism, microstructure, and phase formation in the powders, respectively.
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