Perpendicular magnetic anisotropy in SrTiO3/Co/Pt films induced by oxygen diffusion from CaTiO3 spacer layer
Perpendicular magnetic anisotropy in SrTiO3/Co/Pt films induced by oxygen diffusion from CaTiO3 spacer layer
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CaTiO3 间隔层氧扩散引起的 SrTiO3/Co/Pt 薄膜中的垂直磁各向异性
DOI：
10.1063/5.0007519
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发表时间：
2020-06
影响因子：
4
通讯作者：
Jiang Yong
中科院分区：
文献类型：
--
作者：
Zhang Zeyu;Li Zhipeng;Meng Kangkang;Wu Yong;Chen Jikun;Xu Xiaoguang;Jiang Yong
控制磁性金属在钙钛矿氧化物平台上的垂直磁各向异性（PMA），特别是在广泛使用的SrTiO3衬底上，对于将传统金属自旋电子器件与多功能钙钛矿氧化物集成具有重要的技术意义。在这项工作中，我们通过在SrTiO3（001）衬底上插入非晶态钛酸钙层来调节Co/Pt在SrTiO3（001）衬底上的磁各向异性。通过透射电镜对器件的结晶度和微观结构进行了表征。霍尔效应和磁测量表明，插入层实现了PMA。x射线光电子能谱的电子结构分析表明，面外磁各向异性对应于钛酸钙层中Co-O键密度和Ti价态的降低。结果表明，无定形钛酸钙层可以作为有效的氧源来修饰Co和Ti界面的化学环境，从而调节Co与氧的杂化和磁各向异性。这项工作为在钙钛矿氧化物平台上通过氧扩散来设计金属自旋电子器件的磁各向异性铺平了道路，为多功能自旋轨道扭矩存储器件的可能应用铺平了道路。
The control of perpendicular magnetic anisotropy (PMA) of magnetic metals on a platform of perovskite oxides, especially on widely used SrTiO3 substrates, is of technological importance in integrating conventional metal spintronic devices with multifunctional perovskite oxides. In this work, we tuned the magnetic anisotropy of Co/Pt on SrTiO3 (001) substrates by inserting an interfacial calcium titanate layer with an amorphous state. The crystallinity and device microstructure were characterized by transmission electron microscopy. The Hall effect and magnetic measurement show that the PMA was achieved with the inserting layer. The electronic structure analysis by x-ray photoelectron spectroscopy suggests that out-of-plane magnetic anisotropy corresponds to the appearance of a significant density of Co–O bonding and a reduction of the Ti valence state in the calcium titanate layer. It is indicated that the amorphous calcium titanate layer could serve as an effective oxygen source to modify the chemical environment of the interfacial Co and Ti, resulting in the tuning of hybridization between Co and oxygen as well as the magnetic anisotropy. This work paves the way to engineer the magnetic anisotropy of metallic spintronic devices on the platform of perovskite oxides via oxygen diffusion for possible application in multifunctional spin orbital torque memory devices.
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