Effects of substrate temperature and oxygen pressure on the magnetic properties and structures of CoFe2O4 thin films prepared by pulsed-laser deposition

Growth of crystalline cobalt ferrite thin films at lower temperatures using pulsed-laser deposition technique

“…The films grown at low T DEP showed preferred ͑111͒-texture with some ͑311͒ whereas, at higher temperatures, films prefer to grow in ͑100͒ and ͑311͒ orientation. This represents a considerably different trend from that observed by Zhou et al 10 The growth of crystalline CFO films with ͑111͒-texture at lower temperatures ͑T DEP = 250°C͒ show potential for hybrid multilayer sensor applications and integration with multilayer structures that require lower processing temperatures. anisotropy contribution ͓see Figs.…”

“…It was shown in this study that crystalline CFO thin films with ͑111͒-preferred orientation can be grown at temperatures as low as 250°C, as opposed to the optimum value of 600°C reported in the literature. 10 The films were observed to have a substantial perpendicular magnetic anisotropy, which decreased with decreasing substrate temperature. The variation in perpendicular anisotropy and coercivity with substrate temperature are believed to be predominantly due to the thermal expansion mismatch between the film and the substrate.…”

“…10 Due to the mismatch, when the substrate-film combination is cooled down to room temperature, an in-plane isotropic tension will be induced in the film. The amount of strain induced due to thermal expansion mismatch can be predicted from 11…”

“…5 Depending on the requirements of application, magnetic and magnetoelastic properties of CFO can be fine-tuned by appropriate cation substitution 1,[6][7][8] and magnetic annealing. 9 The optimum substrate temperature for thin film growth has been reported to be 600°C, 10 in order to produce crystalline CFO. However, such high substrate temperatures limit the potential use of CFO in microelectromechanical systems ͑MEMS͒ devices, multilayer hybrid sensors, or integration with giant magnetoresistance, tunneling magnetoresistance, or semiconductor devices.…”

Morphology and magnetic properties of Co0.8Fe2.2O4 films prepared by the chemical solution deposition

“…Several methods have been applied to synthesize cobalt-ferrite films, including the pulsed laser deposition [11], RF magnetron-sputtering method [12,13], and the ionbeam deposition [14]. However, most of above methods cannot be commercially used in growing large-scale films for the requirements of high vacuum and high depositing temperatures.…”