The Effect of A-Site Substitution of Ce and La on the Magnetic and Electronic Properties of Sr(Ti0.6Fe0.4)O3鈭捨?/sub> Films

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• 作者：Peng Jiang ; Lei Bi ; Xueyin Sun ; Dong Hun Kim ; Daming Jiang ; Gaohui Wu ; G. F. Dionne ; C. A. Ross
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：December 17, 2012
• 年：2012
• 卷：51
• 期：24
• 页码：13245-13253
• 全文大小：725K
• 年卷期：v.51,no.24(December 17, 2012)
• ISSN：1520-510X

文摘

The structure and magnetic properties of epitaxial (Ce_xSr_1鈥?i>x)(Ti_0.6Fe_0.4)O_{3鈭捨?/sub> (x = 0, 0.1, 0.2 and 0.3) and (LaxSr1鈥?i>x)(Ti0.6Fe0.4)O3鈭捨?/sub> (x = 0, 0.1, 0.2, 0.3 and 0.4) perovskite-structure thin films deposited by pulsed laser deposition on (LaAlO3)0.3(Sr2AlTaO6)0.7 (LSAT) substrates are reported. Both La and Ce ions showed a dominant 3+ valence state and acted as donors on the Sr²⁺ 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 Fe²⁺ concentration. The materials were magnetic at room temperature with up to 0.8 渭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.}