放射光光電子顕微鏡によるマンガン酸化物微細加工薄膜の磁区観察
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概要
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Perovskite-type manganites have various electronic and magnetic properties by changing their compositions and temperature. It is known that an La0.6Sr0.4MnO3 thin film has a half metallic property, which is expected for the application to magnetic tunneling junctions. To obtain a yield rate of a TMR device accompanied with high-performance of a TMR effect, a single magnetic domain should be made in a La1-xSrxMnO3 thin film. Photoelectron emission microscopy (PEEM) is a powerful tool to directly perform spatial mapping of magnetic domains, combining with using synchrotron radiation beam. We can obtain useful images in terms of a element-selective electronic structure and/or a magnetism. We have performed the direct observation of magnetic domain structures on the microstructures of the La0.6Sr0.4MnO3 thin films using photoelectron emission microscope with synchrotron radxation in order to clarify their magnetic domain formations. The magnetic domain formation depends on a subtle balance between the step-induced uniaxial anisotropy and the shape anisotropy. We reveal that a cooperative effect between the step-induced uniaxial and shape anisotropies makes a single magnetic domain in a patterned LSMO thin film on the micron scale. On the contrary, the competitive effect generates a multi-magnetic domain. This findings provides useful information on the improvement of TMR devices in La1-xSrxMnO3 thin films epitaxialy fabricated on a substrate with step structures.
- 2009-11-20