铁磁性
超级交换
超晶格
异质结
材料科学
氧化物
凝聚态物理
磁圆二色性
相(物质)
铁磁材料性能
顺磁性
磁化
谱线
光电子学
化学
物理
磁场
冶金
量子力学
有机化学
天文
作者
Jie Zheng,Wenxiao Shi,Zhe Li,Jing Zhang,Chao‐Yao Yang,Zhe Yuan,Mengqin Wang,Jine Zhang,Furong Han,Hui Zhang,Yunzhong Chen,Fengxia Hu,Baogen Shen,Yuansha Chen,J. R. Sun
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-03-11
卷期号:18 (12): 9232-9241
标识
DOI:10.1021/acsnano.4c01910
摘要
Due to the strong interlayer coupling between multiple degrees of freedom, oxide heterostructures have demonstrated exotic properties that are not shown by their bulk counterparts. One of the most interesting properties is ferromagnetism at the interface formed between "nonferromagnetic" compounds. Here we report on the interfacial ferromagnetic phase induced in the superlattices consisting of the two paramagnetic oxides CaRuO3 (CRO) and LaNiO3 (LNO). By varying the sublayer thickness in the superlattice period, we demonstrate that the ferromagnetic order has been established in both CaRuO3 and LaNiO3 sublayers, exhibiting an identical Curie temperature of ∼75 K. The X-ray absorption spectra suggest a strong charge transfer from Ru to Ni at the interface, triggering superexchange interactions between Ru/Ni ions and giving rise to the emergent ferromagnetic phase. Moreover, the X-ray linear dichroism spectra reveal the preferential occupancy of the d3z2-r2 orbital for the Ru ions and the dx2-y2 orbital for the Ni ions in the heterostructure. This leads to different magnetic anisotropy of the superlattices when they are dominated by CRO or LNO sublayers. This work clearly demonstrates a charge-transfer-induced interfacial ferromagnetic phase in the whole ferromagnet-free oxide heterostructures, offering a feasible way to tailor oxide materials for desired functionalities.
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