首页|Syntropic spin alignment at the interface between ferromagnetic and superconducting nitrides

Syntropic spin alignment at the interface between ferromagnetic and superconducting nitrides

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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-supercurrent spin-valves and'π'Josephson junctions.Here we report the observation of an induced large magnetic moment at high-quality nitride S/F interfaces.Using polarized neutron reflectometry and DC SQUID 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 TC.Interestingly,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 oxides.First-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 interfaces.Our 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.

magnetic proximity effectsnitride interfacespolarized neutron reflectometrysuperconductor/ferromagnetic interfacessuperconducting spintronics

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

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Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

Spallation Neutron Source Science Center,Dongguan 523803,China

Department of Physics & Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

Ningbo Institute of Materials Technology&Engineering,Chinese Academy of Sciences,Ningbo 315201,China

Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

Songshan Lake Materials Laboratory,Guangdong 523808,China

National Center for Electron Microscopy in Beijing and School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China

Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China

School of Physics,Zhejiang University,Hangzhou 310027,China

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National Key Basic Research Program of ChinaNational Key Basic Research Program of ChinaNational Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)CAS Project for Young Scientists in Basic ResearchGuangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and TechnologyStrategic Priority Research Program(B)of the Chinese Academy of SciencesChina Postdoctoral Science FoundationSpecial Research assistant of Chinese Academy of Sciences

2020YFA03091002019YFA0308500U22A2026352250308121744375207240052025025YSBR-084HT-CSNS-DG-CD-0080/2021XDB330302002022M723353

2024

10.1093/nsr/nwae107

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ISSN：
年,卷(期)：2024.11(8)