Superconducting Triplet Rim Currents in a Spin-Textured Ferromagnetic Disk
Fermin, R., van Dinter, D., Hubert, M., Woltjes, B., Silaev, M., Aarts, J., & Lahabi, K. (2022). Superconducting Triplet Rim Currents in a Spin-Textured Ferromagnetic Disk. Nano Letters, 22(6), 2209-2216. https://doi.org/10.1021/acs.nanolett.1c04051
Published inNano Letters
© 2022 the Authors
Since the discovery of the long-range superconducting proximity effect, the interaction between spin-triplet Cooper pairs and magnetic structures such as domain walls and vortices has been the subject of intense theoretical discussions, while the relevant experiments remain scarce. We have developed nanostructured Josephson junctions with highly controllable spin texture, based on a disk-shaped Nb/Co bilayer. Here, the vortex magnetization of Co and the Cooper pairs of Nb conspire to induce long-range triplet (LRT) superconductivity in the ferromagnet. Surprisingly, the LRT correlations emerge in highly localized (sub-80 nm) channels at the rim of the ferromagnet, despite its trivial band structure. We show that these robust rim currents arise from the magnetization texture acting as an effective spin–orbit coupling, which results in spin accumulation at the bilayer–vacuum boundary. Lastly, we demonstrate that by altering the spin texture of a single ferromagnet, both 0 and π channels can be realized in the same device. ...
PublisherAmerican Chemical Society (ACS)
Publication in research information system
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Related funder(s)Academy of Finland
Funding program(s)Research post as Academy Research Fellow, AoF
Additional information about fundingThis work was supported by the project “Spin texture Josephson junctions” (Project Number 680-91-128) and by the Frontiers of Nanoscience (NanoFront) program, which are both (partly) financed by the Dutch Research Council (NWO). It was also supported by EU Cost Action CA16218 (NANOCOHYBRI) and the Academy of Finland (Project 297439) and benefited from access to The Netherlands Centre for Electron Nanoscopy (NeCEN) at Leiden University. ...
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