Abstract
Control of magnetic anisotropy in low-dimensional systems is of paramount importance in terms of their fundamental and technological perspectives. La0.7Sr0.3MnO3 (LSMO) is a ferromagnetic half-metal with a high Curie temperature and many efforts have been made to control its magnetic anisotropy. However, the relationship between the evolution of the magnetic anisotropy orientation and the electronic structure of low-dimensional LSMO still remains poorly understood. Here, the high-quality superlattices comprised of LSMO and SrMnO3 (SMO) layers are synthesized with a compatible structure at the atomic scale. Their magnetic anisotropy is gradually varied from planar to perpendicular by increasing the SMO thickness, and the special fourfold magnetic anisotropy is also observed at the intermediate superlattice thickness. The evolution of the magnetic anisotropy in these systems is confirmed by the electronic transport and magnetic measurements. Moreover, X-ray linear dichroism measurements and first-principles calculations reveal the interfacial orbital reconstruction with the in-plane to out-of-plane magnetic reorientation transition. Therefore, a new microscopic method for magnetic anisotropy manipulation is developed in the present study, enabling discovery of novel phenomena as well as control of the magnetic properties.
摘要
低维系统磁各向异性的调控无论对于基础研究领域还是对于器件的工业化应用都有着重要的意义. La0.7Sr0.3MnO3(LSMO)展现出的高居里温度以及铁磁半金属特性, 吸引了大量的科研人员对其磁各向异性进行了研究. 但直到目前为止, 关于低维LSMO薄膜中磁各向异性与其电子结构之间的关系尚不明确. 本文中, 我们利用脉冲激光沉积系统制备了高质量、 原子级平整的LSMO/SrMnO3 (SMO) 超晶格. 磁性及电输运实验结果表明, 随着SMO厚度的增加, 超晶格的磁性易轴由面内转向面外方向, 并且在一定厚度时, 超晶格的磁各向异性显示出特殊的四重对称性. X射线线性二色谱及第一性原理计算表明, 超晶格中磁各向异性的变化与界面处轨道重构有关: 随着SMO厚度的增加, 超晶格中电子将由择优占据面内轨道转变为择优占据面外轨道. 本实验提出了一 种调控磁各向异性的新方法, 为异质结中磁性质的控制及新现象的产生提供了新的研究思路.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (51901118, 51871137, 12174237, and 52171183), the 1331 Engineering of Shanxi Province, the Research Project Supported by Shanxi Scholarship Council of China (2021-093), and the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (2020L0237). We acknowledge the XAS measurement at Beamline BL08U1A in Shanghai Synchrotron Radiation Facility (SSRF) and the XLD measurement at Beamline BL12-a in National Synchrotron Radiation Laboratory (NSRL). We thank Dr. Z. Quan and Dr. W. Lin for helpful discussions.
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Author contributions Zhou G and Ji H designed the research and analyzed the data. Ji H grew the samples and carried out the magnetism and transport measurements. Yan Z performed the first-principles calculations. Cai M, Lu J, and Zhang JX helped to characterize the magnetic domain. Kang P and Zhang J contributed to the XAS and XLD measurements. Zhou G, Chen J, and Xu X discussed the results and commented on the manuscript.
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Guowei Zhou obtained his PhD degree from Shanxi Normal University in 2018. He was a research fellow at the National University of Singapore in 2019. He is currently an associate professor in Prof. Xu’s group at Shanxi Normal University. His current research interest focuses on emerging phenomena and exotic physical behaviors in perovskite complex oxides films and heterostructures.
Huihui Ji obtained her Bachelor’s degree from the School of Chemistry and Materials Science, Shanxi Normal University in 2016. After that, she continued her education as a PhD candidate under the supervision of Prof. Xiaohong Xu at Shanxi Normal University. Her research focuses on the interface phenomena in the strongly correlated oxide heterostructures.
Jingsheng Chen received his PhD degree from Lanzhou University, China, in 1999. He joined Nanyang Technological University as a postdoctor in 1999–2001 and the Data Storage Institute, A*STAR as a research scientist in 2001–2007. In the year of 2007, he joined the National University of Singapore as an assistant professor and was promoted to associate professor in 2013. His research interest includes high-anisotropy magnetic materials, spintronics, multiferroic materials, and nanostructured magnetic materials.
Xiaohong Xu received her PhD degree in materials science and engineering from Xi’an Jiaotong University, China in 2001. From 2001 to 2006, she worked as a postdoc or research fellow at Huazhong University of Science and Technology (China), the University of Sheffield (UK), and Tohoku University (Japan). Her research interest includes oxide semiconductor spintronics, magnetic recording media, and interface physics of heterostructures.
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Interfacial Engineering Manipulation of Magnetic Anisotropy Evolution via Orbital Reconstruction in Low-Dimensional Manganite Superlattices
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Zhou, G., Ji, H., Yan, Z. et al. Interfacial engineering manipulation of magnetic anisotropy evolution via orbital reconstruction in low-dimensional manganite superlattices. Sci. China Mater. 65, 1902–1911 (2022). https://doi.org/10.1007/s40843-021-1972-2
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DOI: https://doi.org/10.1007/s40843-021-1972-2