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首页> 外文会议>Symposium on Epitaxial Oxide Thin Films III March 31-April 2, 1997, San Francisco, California,U.S.A >Magnetoresistive La-Sr-Mn-O powders and films by DAAS technique
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Magnetoresistive La-Sr-Mn-O powders and films by DAAS technique

机译：磁阻La-Sr-Mn-O粉末和薄膜的DAAS技术

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摘要

Magnetic perovskites of the general form La_1-xSr-xMnO_3 have successfully been synthesized using deposition by aqueous cetate solution (DAAS). This novel technique, which has the potential for depositing large area thinfilms with high throughput and low cost, involvesthe preparation of an aqueous metal acetate precursor solution, drying the solution to generatea glassy gel, consolidating the gel, and then firing it for short periods of time (<2hrs) to produce crystalline lanthanum strontium manganate (LSMO). The DAAS method has been used to prepare both powders and thin films of LSMO.Powder samples of La_0.83Sr-0.17MnO_3 annealed for 100 minutes at 1200 deg C were high purity, single phase, and exhibited excellent electrical and magnetic characteristics. Thin films of La_0.7Sr_0.3MnO_3 deposited onto both sapphire and stronitum titanate substrates and annealed at 900 deg C were also found to be crystalline, and substrate choice was found to influence thin films crystal structure. These films exhibited sharp metal-insulator transitions, and in the case of LSMO films on strontium titanate, magnetoresistance was observed at the unusually high temperature of approx 360 K.
机译：使用十六烷酸盐水溶液（DAAS）沉积已成功合成了一般形式为La_1-xSr-xMnO_3的磁性钙钛矿。这种新技术具有以高通量和低成本沉积大面积薄膜的潜力，涉及制备乙酸金属盐前体水溶液，干燥溶液以生成玻璃状凝胶，固结凝胶，然后在短时间内烧制。时间（<2小时）以生产结晶锰酸锶锶（LSMO）。 DAAS方法已被用于制备LSMO的粉末和薄膜。La_0.83Sr-0.17MnO_3的粉末样品在1200℃退火100分钟，具有高纯度，单相且具有出色的电磁特性。 La_0.7Sr_0.3MnO_3沉积在蓝宝石和钛酸锶衬底上并在900摄氏度下退火的薄膜也发现是结晶的，发现衬底的选择会影响薄膜的晶体结构。这些膜表现出尖锐的金属-绝缘体转变，并且在钛酸锶上的LSMO膜的情况下，在异常高的约360 K高温下观察到磁阻。

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