School of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University , Beijing 100084, China.
NUSNNI-NanoCore, National University of Singapore , Singapore 117411, Singapore.
ACS Appl Mater Interfaces. 2017 Dec 27;9(51):44931-44937. doi: 10.1021/acsami.7b15364. Epub 2017 Dec 13.
Engineering ferromagnetism, by modulating its magnitude or anisotropy, is an important topic in the field of magnetism and spintronics. Among different types of magnetic materials, ferromagnetic insulators, in which magnetic moment unusually coexists with localized electrons, are of particular interest. Here, we report a remarkable interfacial enhancement of the ferromagnetism by adding one unit-cell LaAlO adjacent to an insulating LaMnO ultrathin film. The enhancement of ferromagnetism is explained in terms of charge transfer at the interface, as evidenced by X-ray absorption spectroscopy and ab initio calculations. This study demonstrates an effective and dramatic approach to modulate the functionality of ferromagnetic insulators, contributing to the arsenal of engineering techniques for future spintronics.
通过调节其大小或各向异性来实现铁磁性是磁性和自旋电子学领域的一个重要课题。在不同类型的磁性材料中，铁磁绝缘体特别引人注目，其中磁矩异常地与局域电子共存。在这里，我们报告了通过在绝缘 LaMnO 超薄薄膜旁边添加一个单位晶胞 LaAlO，显著增强了铁磁性。通过 X 射线吸收光谱和从头算计算证实，界面处的电荷转移解释了铁磁性的增强。这项研究展示了一种有效而剧烈的方法来调节铁磁绝缘体的功能，为未来的自旋电子学提供了更多的工程技术手段。
