Magnetic neighbor effect and interfacial charge transfer induced layered ferromagnetic structures

Source: Institute of Physics, Academy of Sciences

As a typical correlated electron system, perovskite nickel oxide exhibits a series of rich physical properties such as metal-insulator phase transition and topological phase transition. Recently, due to the successive discoveries of 112-phase and 327-phase nickel-based superconducting systems, nickel oxide has become a hot spot in the field of functional oxide materials/devices research. Generally, perovskite nickel oxide will undergo a metal-insulator phase transition as the temperature decreases, accompanied by a magnetic paramagnetic-antiferromagnetic phase transition. LaNiO3 has become the only system among perovskite nickel oxides that maintains Pauli paramagnetic properties in the full temperature range. Therefore, designing and regulating the magnetic ground state of LaNiO3 from an experimental or theoretical perspective has always been a matter of great concern. Previous research results have shown that the magnetic proximity effect based on the nickel oxide/manganese oxide interface can induce a magnetically ordered interface phase in LaNiO3. However, there has been a large debate about its magnetic ground state configuration. For example, some articles reported that in the heterojunction formed by the combination of LaNiO3 and LaNiO3, the LaNiO3 interface layer is in the antiferromagnetic state of (1/4, 1/4, 1/4) wave vector; and about LaNiO3/La0.7Sr0. 3MnO3 heterojunction, different literature reported the results that the LaNiO3 layer is in a spiral spin state or a ferromagnetic state. These contradictory conclusions hinder people’s in-depth understanding of the physical laws of systems similar to the interface magnetic proximity effect, and also hinder the possibility of practical applications related to the low-dimensional magnetic phase at the interface.

Magnetic neighbor effect and interfacial charge transfer induced layered ferromagnetic structures

Recently, Wang Mengqin, a doctoral student in the M03 group of the State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences/Beijing National Research Center for Condensed Matter Physics, under the joint guidance of Associate Researcher Chen Yuansha, Researcher Hu Fengxia, and Researcher Sun Jirong, and Associate Researcher Zhang Qinghua of the Institute of Physics, Researcher Zhu Tao and others used spectrometer methods such as space-resolved polarization neutron reflectometry, electron energy loss spectroscopy, and X-ray absorption spectroscopy, combined with macroscopic Hall electric transport measurement results, to successfully reveal that the LaNiO3/LaNiO3(111) interface is composed of magnetic Layered magnetic structures resulting from proximity and charge transfer effects. They found that the heterojunction system will have four layered ferromagnetic phases, namely insulating LaNiO3 bulk phase, semiconductor LaNiO3 interface phase (about 3 unit cell layers), insulating LaNiO3 interface phase (about 5 unit cell layers) and Metallic LaNiO3 bulk phase. The reason for the appearance of the layered magnetic structure is the Mn4+-Ni2+ super-exchange and Mn4+-Mn3+ double exchange caused by charge transfer from interface Mn to Ni. This layered magnetic structure provides a template for in-depth analysis of magnetic heterojunction systems with strong interfacial charge transfer, and also provides an effective means for designing more interfacial low-dimensional magnetic systems and regulating their physical properties.

This result was published in “Nano Letters” under the title “Layered Ferromagnetic Structure Caused by the Proximity Effect and Interlayer Charge Transfer for LaNiO3/LaNiO3 Superlattices”. This work was supported by the Ministry of Science and Technology, the National Natural Science Foundation of China, the Strategic Priority Science and Technology Project of the Chinese Academy of Sciences, and the key projects of the Chinese Academy of Sciences. The research work has also received strong support from large scientific facility centers including the China Spallation Neutron Source and the Shanghai Synchrotron Radiation Light Source BL08U1A Line Station.

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