Abstract We study the perpendicular exchange bias (PEB) and spin-orbit torque (SOT) generation in the Pt/Co/MgO heterostructure by changing the thickness of the MgO layer. We show that the oxidation of the beneath Co layer increases with the MgO thickness. Strong PEB is obtained in the Pt/Co/MgO films, which exhibits a much higher blocking temperature compared with that in the Pt/Co/CoO films. Furthermore, it is found that the MgO thickness has significant effect on the SOT generation. Maximum values of the SOTs are obtained with a 0.8 nm-thick MgO layer, which decreases by increasing the MgO thickness from 0.8 to 1.6 nm. Our results shed a light on the essential role of the MgO layer in the heavy metal/ferromagnet/MgO heterostructure, a typical material system in spintronic devices, and provide a way to manipulate the magnetic properties and the SOTs by oxide layers.

中文翻译：

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通过 Pt/Co/MgO 薄膜中的 MgO 操纵垂直交换偏置和自旋轨道扭矩

摘要 我们通过改变 MgO 层的厚度来研究 Pt/Co/MgO 异质结构中的垂直交换偏置 (PEB) 和自旋轨道扭矩 (SOT) 的产生。我们表明，下方 Co 层的氧化随着 MgO 厚度的增加而增加。在 Pt/Co/MgO 薄膜中获得了强 PEB，与 Pt/Co/CoO 薄膜相比，它表现出更高的阻挡温度。此外，发现 MgO 厚度对 SOT 的生成有显着影响。SOT 的最大值是通过 0.8 nm 厚的 MgO 层获得的，通过将 MgO 厚度从 0.8 nm 增加到 1.6 nm 而降低。我们的结果揭示了 MgO 层在重金属/铁磁体/MgO 异质结构中的重要作用，这是自旋电子器件中的典型材料系统，