Ferromagnetism in LaFeO3/LaNiO3 superlattices with high Curie temperature

作者：Tianlin Zhou, Fei Gao, Qinghua Zhang, Yuansha Chen, Yuansha Chen, Y.‐L. He, Y.‐L. He, Yuchen Zhao, Minghang Li, Minghang Li, Shaojin Qi, Fengxia Hu, Jirong Sun, Baogen Shen, Yunzhong Chen, Baogen Shen · 发表于：Nature Communications · 年份：2025 · DOI：10.1038/s41467-025-58968-z · 被引用次数：6 · 研究领域：Magnetic and transport properties of perovskites and related materials、Electronic and Structural Properties of Oxides、Multiferroics and related materials

Interfacing complex oxides in atomically engineered layered structures can give rise to a wealth of exceptional electronic and magnetic properties that surpass those of the individual building blocks. Herein, we demonstrate a ferromagnetic spin order with a high Curie temperature of 608 K in superlattices consisting of otherwise paramagnetic perovskite LaNiO3 (LNO) and antiferromagnetic LaFeO3 (LFO). The ferromagnetism likely results from the covalent exchange due to interfacial charge transfer from Fe to Ni cations. By deliberately controlling the thickness of the LNO sublayers thus the amount of charge transfer, a robust ferromagnetism of 4 uB is realized for a stacking periodicity consisting of one single unit cell of both LNO and LFO, an emergent double perovskite phase of La2FeNiO6 with B-site layered ordering configurations. The ferromagnetic LFO/LNO superlattices offer great potential for the search of emergent magnetodielectric and/or multiferroic properties as well as applications in spintronics and electrocatalysts. Perovskite oxides, when combined into heterostructures and superlattices can yield emergent properties not present in the constituent components. Here, by combining LaNiO3, a Pauli paramagnetic material, with LaFeO3, an antiferromagnetic insulator, Zhou et al create a strongly ferromagnetic superlattice with a Curie temperature of over 600 K.