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Updated: Jun 17, 2026

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
Published on: February 8, 2018
Fe Atomic Monolayer in a Coherent Interface: Electrostatic Potential-Induced Segregation and Interfacial Magnetism
Ang Tao1,2, Yixiao Jiang1,2, Jiaqi Liu1,2
1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Abstract:
Interfaces and boundaries often trap various impurities so that they play a crucial role in tailoring the mechanical and physical properties of materials and devices. Due to the perfect lattice matching, impurity segregation at coherent interfaces and the corresponding effects on material properties have rarely been reported. In this study, we demonstrate the segregation of an Fe atomic monolayer in a Sr3MgSi2O8/SrTiO3 coherent heterointerface and the resulting interfacial magnetism by combining aberration-corrected transmission electron microscopy, magnetic force microscopy, and first-principles calculations. It is revealed that the segregated Fe atomic monolayer consists of Fe3+ ions and exhibits ferromagnetism. The Sr3MgSi2O8/SrTiO3 coherent interface shows no strain concentration with the Fe segregation driven by the minimization of interfacial electrostatic potential. These findings could deepen our understanding of impurity segregation at coherent interfaces. The as-received interfacial magnetism at the coherent interface is expected to play important roles in applications of future spintronic nanodevices.
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