Long-range skin Josephson supercurrent across a van der Waals ferromagnet

Guojing Hu, Changlong Wang, Shasha Wang, Ying Zhang, Yan Feng, Zhi Wang (), Qian Niu, Zhenyu Zhang and Bin Xiang ()
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Guojing Hu: University of Science and Technology of China
Changlong Wang: University of Science and Technology of China
Shasha Wang: University of Science and Technology of China
Ying Zhang: University of Science and Technology of China
Yan Feng: University of Science and Technology of China
Zhi Wang: Sun Yat-sen University
Qian Niu: University of Science and Technology of China
Zhenyu Zhang: University of Science and Technology of China
Bin Xiang: University of Science and Technology of China

Nature Communications, 2023, vol. 14, issue 1, 1-6

Abstract: Abstract The emerging field of superconducting spintronics promises new quantum device architectures without energy dissipation. When entering a ferromagnet, a supercurrent commonly behaves as a spin singlet that decays rapidly; in contrast, a spin-triplet supercurrent can transport over much longer distances, and is therefore more desirable, but so far has been observed much less frequently. Here, by using the van der Waals ferromagnet Fe3GeTe2 (F) and spin-singlet superconductor NbSe2 (S), we construct lateral Josephson junctions of S/F/S with accurate interface control to realize long-range skin supercurrent. The observed supercurrent across the ferromagnet can extend over 300 nm, and exhibits distinct quantum interference patterns in an external magnetic field. Strikingly, the supercurrent displays pronounced skin characteristics, with its density peaked at the surfaces or edges of the ferromagnet. Our central findings shed new light on the convergence of superconductivity and spintronics based on two-dimensional materials.

Date: 2023
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DOI: 10.1038/s41467-023-37603-9

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