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Surface And Transport Studies On La_(0.7)ba_(0.3)mno_3:sno_2 Bilayer

机译:La_(0.7)ba_(0.3)mno_3:sno_2双层的表面和输运研究

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We report on study of morphology, optical contrast and transport characteristics of La_(0.7)Ba_(0.3)MnO_3 (LBMO) manganite thin films bilayered with SnO_2 on Si (0 0 1) substrate, synthesized using pulsed laser deposition system. X-ray diffraction study reveals that both LBMO and SnO_2 show polycrystalline growth over the substrate. Atomic force microscopy shows interesting pyramidal structures of LBMO of size ~2 μm × 1 μm × 0.1 μm. On the other hand, SnO_2 grows in the form of close packed cylindrical clusters of ~200nm radius. Near-field optical microscopy (NSOM) study using 532 nm laser reveal that optical NSOM output intensity in LBMO is four times less than SnO_2 signal. Transport characterizations show that this bilayer configuration exhibit non-linear current-voltage characteristics from 300 upto 50 K. The nature becomes linear below this temperature. The results project the system as a promising candidate in non-conventional device category in the area of spintronics.
机译:我们报道了使用脉冲激光沉积系统合成的在Sn(0 0 1)衬底上与SnO_2双层叠层的La_(0.7)Ba_(0.3)MnO_3(LBMO)锰矿薄膜的形貌,光学对比度和传输特性的研究。 X射线衍射研究表明,LBMO和SnO_2均在基材上显示出多晶生长。原子力显微镜显示有趣的LBMO金字塔结构,大小约为2μm×1μm×0.1μm。另一方面,SnO_2以密堆积的〜200nm半径的圆柱形簇的形式生长。使用532 nm激光进行的近场光学显微镜(NSOM)研究表明,LBMO中的光学NSOM输出强度比SnO_2信号小四倍。传输特性表明,这种双层结构表现出从300到50 K的非线性电流-电压特性。在该温度以下,该特性变为线性。结果表明该系统是自旋电子学领域非常规设备类别的有希望的候选者。

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