La_1−xSr_xMnO₃ (LSMO) is well known as an efficient spin-injection electrode in ferromagnetic–organic hybrid-based organic spin valves (OSV). Herein, we examine the influence of three terminating layers of LSMO films (mixed-, MnO₂-, and LaSrO- (LSO-) terminated) on the spin filter at the bottom interface of tri (8-hydroxyquinoline) aluminum (Alq₃) deposited on these substrates. Angle-dependent X-ray photoelectron spectra (XPS) demonstrated the presence of SrO segregation at the outermost layer for three types of LSMO films but in different amounts that might contribute to their magnetic properties. A weak surface coupling between LSMO and Alq₃ was obtained through a small increase of Mn L-edge X-ray magnetic circular dichroism (XMCD) but it does not vary the bulk magnetic properties of LSMO films upon Alq₃ adsorption (LSMO/Alq₃). The surface dipoles due to the interaction between LSMO films and Alq₃ were found to be 0.5, 0.5, and 0.7 eV for the mixed-ter/Alq₃, MnO₂-ter/Alq₃, and LSO-ter/Alq₃ interfaces, respectively. Our results indicate that the segregated SrO layer plays an important role in the surface electronic and magnetic properties at LSMO/Alq₃ interfaces, which contributes to a fundamental understanding of the spin injection and transport in LSMO-Alq₃ hybrid-based OSV devices.

中文翻译：

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对自旋阀进行终端控制的LSMO / Alq ₃异质结的自旋过滤

La _{1- x} Sr _x MnO ₃（LSMO）在铁磁-有机混合基有机自旋阀（OSV）中是一种有效的自旋注入电极。在这里，我们研究了三（8-羟基喹啉）铝（Alq ₃）底部界面处LSMO膜的三个终止层（混合的，MnO _2-和LaSrO-（LSO-）终止）对自旋滤池的影响。沉积在这些基板上。角度相关的X射线光电子能谱（XPS）证明，对于三种类型的LSMO膜，SrO偏析存在于最外层，但数量不同可能会影响其磁性能。LSMO和Alq ₃之间的弱表面耦合通过少量增加Mn L边缘X射线磁性圆二色性（XMCD）可以得到，但它不会改变Alq ₃吸附（LSMO / Alq ₃）后LSMO膜的体磁性能。对于混合ter / Alq ₃，MnO ₂ -ter / Alq ₃和LSO-ter / Alq ₃界面，由于LSMO薄膜和Alq ₃之间的相互作用而产生的表面偶极子分别为0.5、0.5和0.7 eV ，分别。我们的结果表明，隔离的SrO层在LSMO / Alq ₃界面的表面电子和磁性中起着重要作用，这有助于对LSMO-Alq中的自旋注入和传输有一个基本的了解。₃个基于混合的OSV设备。