Long-range skin Josephson supercurrent across a van der Waals ferromagnet.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36997575.
- Also identified by DOI 10.1038/s41467-023-37603-9 and PMC identifier 10063542.
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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 Fe<sub>3</sub>GeTe<sub>2</sub> (F) and spin-singlet superconductor NbSe<sub>2</sub> (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.