Pulsed Laser Deposition of Rocksalt Magnetic Binary Oxides

[摘要] Magnetic binary oxides with the rocksalt structure constitute an important class of materials for potential applications as electronic or electrochemical devices. Moreover, they often become a theoretical playground, due to the simple electronic and crystal structures, in the quest for novel phenomena. For these possibilities to be realized, a necessary prerequisite would be to grow atomically ordered and controllably-strained binary oxides on proper substrates. Here we systematically explore the use of pulsed laser deposition technique (PLD) to grow three basic oxides that have rocksalt structure but different chemical stability in the ambient atmosphere: NiO (stable), MnO (metastable) and EuO (unstable). By tuning laser fluence F-L, an epitaxial single-phase NiO thin-film growth can be achieved in a wide range of growth temperatures 10 <= T-G <= 750 degrees C. At the lowest T-G, the out-of-plane strain raises to 1.5%, which is five times higher than in NiO film grown at 750 degrees C. MnO thin films that had long-range order were successfully deposited on the MgO substrates after appropriate tuning of deposition parameters. The growth of MnO phase was strongly influenced by F-L and the T-G. EuO films with satisfactory quality were deposited by PLD after oxygen availability had been minimized. Synthesis of EuO thin films at rather low T-G = 350 degrees C prevented thermally-driven lattice relaxation and allowed growth of strained films. Overall, PLD was a quick and reliable method to grow binary oxides with rocksalt structure in high quality that can satisfy requirements for applications and for basic research.

[发布日期] 2019-12-31

[关键词] Strain engineering;Long-range ordered;Thin films;Nickel monoxide;Manganese monoxide;Europium monoxide