Epitaxial BiFe_0.95Mn_0.05O₃ thin films on transparent La_0.07Ba_0.93SnO₃ electrodes

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• 作者：Qinzhuang Liu ; Hong Li ; Lele Fan
• 关键词：Multiferroics ; Polarization ; Optical properties ; Thin film ; Alkaline earth stannate ; Pulsed laser deposition
• 刊名：Journal of Alloys and Compounds
• 出版年：2013
• 出版时间：25 December, 2013
• 年：2013
• 卷：581
• 期：Complete
• 页码：479-483
• 全文大小：796 K

文摘

By employing conductive and transparent La_0.07Ba_0.93SnO₃ (LBSO) films as bottom electrodes, epitaxial BiFe_0.95Mn_0.05O₃ (BFMO) ferroelectric capacitors were fabricated on SrTiO₃(0 0 1) [STO(0 0 1)] substrates by pulsed laser deposition method. The LBSO films showed an excellent optical transmittance in the visible range and a weak metallic conductive behavior, with the room-temperature resistivity, carrier concentration, and mobility of 1.223 m¦¸ cm, 5.54 ¡Á 10²¹ cm^?3, and 0.923 cm²/V s, respectively. X-ray photoelectron spectroscopy and X-ray absorption near-edge structure spectra analysis revealed that iron ions were present primarily as Fe³⁺ in BFMO films. The band gap of BFMO films was determined to be 2.63 eV from the optical transmittance of the BFMO/LBSO/STO(0 0 1) heterostructures. Pt/BFMO/LBSO/STO(0 0 1) structured ferroelectric thin-film capacitors showed well-saturated rectangular-shaped polarization-electric field hysteresis loops with the remanent polarization of 45 ¦ÌC/cm² at a measurement frequency of 1 kHz, indicating that the perovskite-type LBSO films can be potentially used in transparent devices especially based on all-perovskite heterostructures.