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Syntropic spin alignment at the interface between ferromagnetic and superconducting nitrides

National Science Review 2024年第8期11卷 167-179页

作者： Qiao Jin Qinghua Zhang He Bai Meng Yang Yonglong Ga Shengru Chen Haitao Hong Ting Cui Dongke Rong Ting Lin Jia-Ou Wang Chen Ge Can Wang Yanwei Cao Lin Gu Guozhu Song Shanmin Wang Kun Jiang Zhi-Gang Cheng Tao Zhu Hongxin Yang Kui-juan Jin Er-Jia Guo Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Spallation Neutron Source Science Center Department of Physics & Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Ningbo Institute of Materials Technology &Engineering Chinese Academy of Sciences Institute of High Energy Physics Chinese Academy of Sciences Songshan Lake Materials Laboratory National Center for Electron Microscopy in Beijing and School of Materials Science and Engineering Tsinghua University Department of Physics Southern University of Science and Technology School of Physics Zhejiang University

The magnetic correlations at the superconductor/ferromagnet（S/F） interfaces play a crucial role in realizing dissipation-less spin-based logic and memory technologies,such as triplet-sup ercurrent spin-valves and 'π'Josephson *** we report the observation of an induced large magnetic moment at high-quality nitride S/F *** polarized neutron reflectometry and DC S QUID measurements,we quantitatively determined the magnetization profile of the S/F bilayer and confirmed that the induced magnetic moment in the adjacent superconductor only exists below ***,the direction of the induced moment in the superconductors was unexpectedly parallel to that in the ferromagnet,which contrasts with earlier findings in S/F heterostructures based on metals or ***-principles calculations verified that the unusual interfacial spin texture observed in our study was caused by the Heisenberg direct exchange coupling with constant J～4.28 meV through d-orbital overlapping and severe charge transfer across the *** work establishes an incisive experimental probe for understanding the magnetic proximity behavior at S/F interfaces and provides a prototype epitaxial 'building block' for superconducting spintronics.

关键词： magnetic proximity effects nitride interfaces polarized neutron reflectometry superconductor/ferromagnetic interfaces superconducting spintronics

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