A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Superconducting Triplet Rim Currents in a Spin-Textured Ferromagnetic Disk (2022)

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

JYU-tekijät tai -toimittajat

Silaev, Mikhail

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Fermin, Remko; van Dinter, Dyon; Hubert, Michel; Woltjes, Bart; Silaev, Mikhail; Aarts, Jan; Lahabi, Kaveh

Lehti tai sarja: Nano Letters

ISSN: 1530-6984

eISSN: 1530-6992

Julkaisuvuosi: 2022

Ilmestymispäivä: 03.03.2022

Volyymi: 22

Lehden numero: 6

Artikkelin sivunumerot: 2209-2216

Kustantaja: American Chemical Society (ACS)

Julkaisumaa: Yhdysvallat (USA)

Julkaisun kieli: englanti

DOI: https://doi.org/10.1021/acs.nanolett.1c04051

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Osittain avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/80191

Tiivistelmä

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.

YSO-asiasanat: suprajohteet; suprajohtavuus; nanotekniikka; magnetismi; fysiikka