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arXiv 1302.5600cond-mat.mtrl-sci
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La0 .7Sr0.3MnO3薄膜磁畴结构的变温扫描电镜极化分析

Magnetic Domain Structure of La0.7Sr0.3MnO3 thin-films probed at variable temperature with Scanning Electron Microscopy with Polarization Analysis

Robert M. Reeve, Christian Mix, Markus König, Michael Foerster, Gerhard Jakob, Mathias Kläui

摘要:

50 nm厚的La0.7SrMnO3薄膜的域配置已直接使用扫描电子显微镜与极化分析(SEMPA)的研究,与磁衬度,而无需事先的表面制备的要求。大规模的域结构主要反映了四重各向异性,与一个小的单轴分量,磁光克尔效应测量一致。我们还确定了域过渡的配置文件,并发现它是在与以前的估计在这种材料中的域壁宽度。的图像对比度的温度依赖性的研究和超导量子干涉装置的磁强计数据相比。一个更快的SEMPA对比度的下降被揭示,这可以被解释的技术的极端表面灵敏度,使我们能够选择性地探测表面自旋极化,由于双交换机制表现出明显不同的温度依赖性比体磁化。

英文摘要:

The domain configuration of 50 nm thick La0.7SrMnO3 films has been directly investigated using scanning electron microscopy with polarization analysis (SEMPA), with magnetic contrast obtained without the requirement for prior surface preparation. The large scale domain structure reflects a primarily four-fold anisotropy, with a small uniaxial component, consistent with magneto-optic Kerr effect measurements. We also determine the domain transition profile and find it to be in agreement with previous estimates of the domain wall width in this material. The temperature dependence of the image contrast is investigated and compared to superconducting-quantum interference device magnetometry data. A faster decrease in the SEMPA contrast is revealed, which can be explained by the technique's extreme surface sensitivity, allowing us to selectively probe the surface spin polarization which due to the double exchange mechanism exhibits a distinctly different temperature dependence than the bulk magnetization.

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