Asymmetric interfaces and high-TC ferromagnetic phase in La0.67Ca0.33MnO3/SrRuO3 superlattices
Asymmetric interfaces and high-TC ferromagnetic phase in La0.67Ca0.33MnO3/SrRuO3 superlattices
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La0.67Ca0.33MnO3/SrRuO3 超晶格中的不对称界面和高 T-C 铁磁相
DOI：
10.1007/s12274-021-3644-0
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发表时间：
2021
期刊：
影响因子：
9.9
通讯作者：
Wenbin Wu
中科院分区：
文献类型：
--
作者：
Lili Qu;Da Lan;Liang Si;Chao Ma;Shasha Wang;Liqiang Xu;Kexuan Zhang;Feng Jin;Zixun Zhang;Enda Hua;Binbin Chen;Guanyin Gao;Feng Chen;Haifeng Du;Karsten Held;Lingfei Wang;Wenbin Wu
功能氧化物异质结构中的界面磁性不仅表现出有趣的物理现象，而且蕴含着巨大的器件应用潜力。在这些体系中，界面结构和电子重构对于提高磁性的稳定性和可调性是必不可少的。在这项工作中，我们将La0.67Ca0.33MnO(LCMO)和SrRuO(SRO)超薄薄膜构建成超晶格，显示出坚固的铁磁性相。高居里温度(TC)达到291K，比块体LCMO高出30K以上。我们发现LCMO/SRO超晶格由原子锐化的非对称异质界面组成。这种独特的界面结构可以触发相当大的电荷转移以及类似铁电体的极化失真。这两种界面效应共同稳定了高TC铁磁性相。我们的结果可能为有效控制界面磁性和新设计基于氧化物的自旋电子器件提供一条有希望的途径。
Interfacial magnetism in functional oxide heterostructures not only exhibits intriguing physical phenomena but also implies great potential for device applications. In these systems, interfacial structural and electronic reconstructions are essential for improving the stability and tunability of the magnetic properties. In this work, we constructed ultra-thin La0.67Ca0.33MnO3(LCMO) and SrRuO3(SRO) layers into superlattices, which exhibited a robust ferromagnetic phase. The high Curie temperature (TC) reaches 291 K, more than 30 K higher than that of bulk LCMO. We found that the LCMO/SRO superlattices consisted of atomically-sharp and asymmetric heterointerfaces. Such a unique interface structure can trigger a sizable charge transfer as well as a ferroelectric-like polar distortion. These two interfacial effects cooperatively stabilized the high-TCferromagnetic phase. Our results could pave a promising approach towards effective control of interfacial magnetism and new designs of oxide-based spintronic devices.