Van der Waals ferromagnetic Josephson junctions

Linfeng Ai, Enze Zhang, Jinshan Yang, Xiaoyi Xie, Yunkun Yang, Zehao Jia, Yuda Zhang, Shanshan Liu, Zihan Li, Pengliang Leng, Xiangyu Cao, Xingdan Sun, Tongyao Zhang, Xufeng Kou, Zheng Han, Faxian Xiu () and Shaoming Dong ()
Additional contact information
Linfeng Ai: Fudan University
Enze Zhang: Fudan University
Jinshan Yang: Chinese Academy of Sciences
Xiaoyi Xie: Fudan University
Yunkun Yang: Fudan University
Zehao Jia: Fudan University
Yuda Zhang: Fudan University
Shanshan Liu: Fudan University
Zihan Li: Fudan University
Pengliang Leng: Fudan University
Xiangyu Cao: Fudan University
Xingdan Sun: Chinese Academy of Sciences
Tongyao Zhang: Shanxi University
Xufeng Kou: ShanghaiTech University
Zheng Han: Chinese Academy of Sciences
Faxian Xiu: Fudan University
Shaoming Dong: Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Superconductor-ferromagnet interfaces in two-dimensional heterostructures present a unique opportunity to study the interplay between superconductivity and ferromagnetism. The realization of such nanoscale heterostructures in van der Waals (vdW) crystals remains largely unexplored due to the challenge of making atomically-sharp interfaces from their layered structures. Here, we build a vdW ferromagnetic Josephson junction (JJ) by inserting a few-layer ferromagnetic insulator Cr2Ge2Te6 into two layers of superconductor NbSe2. The critical current and corresponding junction resistance exhibit a hysteretic and oscillatory behavior against in-plane magnetic fields, manifesting itself as a strong Josephson coupling state. Also, we observe a central minimum of critical current in some JJ devices as well as a nontrivial phase shift in SQUID structures, evidencing the coexistence of 0 and π phase in the junction region. Our study paves the way to exploring sensitive probes of weak magnetism and multifunctional building-blocks for phase-related superconducting circuits using vdW heterostructures.

Date: 2021
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DOI: 10.1038/s41467-021-26946-w

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