| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Strong Anisotropic Order Parameters at All-Nitride Ferromagnet/Superconductor Interfaces |
| Qiao Jin1†, Meng Yang1,2†, Guozhu Song3, Nan Zhao3, Shengru Chen1,2, Haitao Hong1,2, Ting Cui1,2, Dongke Rong1,2, Qianying Wang1,2, Yiyan Fan1, Chen Ge1,2,4, Can Wang1,2,4, Jiachang Bi5, Yanwei Cao5, Liusuo Wu3, Shanmin Wang3, Kui-Juan Jin1,2,4*, Zhi-Gang Cheng1,4*, and Er-Jia Guo1,2* |
1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2Department of Physics & Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
4Songshan Lake Materials Laboratory, Dongguan 523808, China
5Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China
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| Cite this article: |
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Qiao Jin, Meng Yang, Guozhu Song et al 2024 Chin. Phys. Lett. 41 027402 |
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Abstract Proximity effects between superconductors and ferromagnets (SC/FM) hold paramount importance in comprehending the spin competition transpiring at their interfaces. This competition arises from the interplay between Cooper pairs and ferromagnetic exchange interactions. The proximity effects between transition metal nitrides (TMNs) are scarcely investigated due to the formidable challenges of fabricating high-quality SC/FM interfaces. We fabricated heterostructures comprising SC titanium nitride (TiN) and FM iron nitride (Fe$_{3}$N) with precise chemical compositions and atomically well-defined interfaces. The magnetoresistance of Fe$_{3}$N/TiN heterostructures shows a distinct magnetic anisotropy and strongly depends on the external perturbations. Moreover, the superconducting transition temperature $T_{\scriptscriptstyle{\rm C}}$ and critical field of TiN experience notable suppression when proximity to Fe$_{3}$N. We observe the intriguing competition of interfacial spin orientations near $T_{\scriptscriptstyle{\rm C}}$ ($\sim$ $1.25$ K). These findings not only add a new materials system for investigating the interplay between superconductor and ferromagnets, but also potentially provide a building block for future research endeavors and applications in the realms of superconducting spintronic devices.
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Received: 15 November 2023
Published: 26 February 2024
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| PACS: |
74.45.+c
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(Proximity effects; Andreev reflection; SN and SNS junctions)
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73.40.-c
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(Electronic transport in interface structures)
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74.25.Ha
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(Magnetic properties including vortex structures and related phenomena)
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75.70.-i
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(Magnetic properties of thin films, surfaces, and interfaces)
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