LaMnO3 Thin Films Grown by Using Pulsed Laser Deposition and Their Simple Recovery to a Stoichiometric Phase by Annealing
We systematically investigated various physical properties of epitaxial LaMnO3 thin films fabricated on SrTiO3 substrate by using pulsed laser deposition. In particular, we observed drastic changes in their properties when the as-grown films were annealed in a reduced-oxygen atmosphere. Whereas the as-grown LaMnO.3 film showed ferromagnetic and semiconducting properties with a small optical band gap, the LaMnO3 films annealed at temperature higher than 700 °C showed antiferromagnetic and insulating properties with an enlarged band gap. The optical features also changed drastically, in that the optical transition peak shifted to a higher energy with additional fine structures. Such changes were made in a direction such that the LaMnO3 films were more stoichiometric, indicating that the stoichiometric phase could be recovered by simple annealing of the pulsed-laser-deposited films. Finally, possibilities of the polar catastrophe scenario at the interface between LaMnO3 and SrTiO3 are briefly discussed.
LaMnO3 SrTiO3 Pulsed laser deposition Stoichiometry Interface Optical spectroscopy Magnetic property
Woo Seok Choi Da Woon Jeong Seung Yup Jang Z. Marton Sung Seok A. SeO Ho Nyung Lee Yun Sang Lee
Research Center for Functional Interface, Department of Physics and Astronomy,Seoul National Univers Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 Department of Physics, Soongsil University, Seoul 156-743, Korea
国际会议
首尔
英文
569-574
2010-02-07（万方平台首次上网日期，不代表论文的发表时间）