Department of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, People's Republic of China.
Inorg Chem. 2012 Dec 17;51(24):13245-53. doi: 10.1021/ic301726w. Epub 2012 Dec 4.
The structure and magnetic properties of epitaxial (Ce(x)Sr(1-x))(Ti(0.6)Fe(0.4))O(3-δ) (x = 0, 0.1, 0.2 and 0.3) and (La(x)Sr(1-x))(Ti(0.6)Fe(0.4))O(3-δ) (x = 0, 0.1, 0.2, 0.3 and 0.4) perovskite-structure thin films deposited by pulsed laser deposition on (LaAlO(3))(0.3)(Sr(2)AlTaO(6))(0.7) (LSAT) substrates are reported. Both La and Ce ions showed a dominant 3+ valence state and acted as donors on the Sr(2+) site (A site) in the perovskite lattice. The optical band gap widened, and the Fermi level moved toward the vacuum level with increased Ce or La content; meanwhile the Ti and particularly the Fe ions were driven to a lower valence state, resulting in a higher Fe(2+) concentration. The materials were magnetic at room temperature with up to 0.8 μ(B)/Fe and a magnetoelastic out-of-plane anisotropy. Ce and La lowered the coercivity while raising both the Faraday rotation at 1550 nm and the optical absorption at near-infrared wavelengths.
采用脉冲激光沉积法在（LaAlO3）0.3（Sr2AlTaO6）0.7（LSAT）衬底上沉积了外延（Ce(x)Sr(1-x))(Ti(0.6)Fe(0.4))O(3-δ)（x = 0、0.1、0.2 和 0.3）和（La(x)Sr(1-x))(Ti(0.6)Fe(0.4))O(3-δ)（x = 0、0.1、0.2、0.3 和 0.4）钙钛矿结构薄膜，报道了其结构和磁性。La 和 Ce 离子均显示出主导的 3+价态，并在钙钛矿晶格的 Sr2+（A 位）上充当施主。随着 Ce 或 La 含量的增加，光学带隙变宽，费米能级向真空能级移动；同时，Ti 特别是 Fe 离子被驱动到较低的价态，导致 Fe2+浓度增加。这些材料在室温下具有高达 0.8 μB/Fe 的磁矩和磁弹体外延各向异性。Ce 和 La 降低了矫顽力，同时提高了 1550nm 处的法拉第旋转和近红外波长处的光吸收。
